[
  {
    "id": "clock-overnight-utc-0",
    "english": "The date of event ON-utc-0 is 2026-01-15. It is scheduled at 09:00 UTC.",
    "ainglish": "The date of event ON-utc-0 is 2026-01-15. It is scheduled at 09:00Z.",
    "question": "Which UTC instant is the event scheduled for? A = 2026-01-15 09:00 UTC. B = not determined. C = 2026-01-15 00:00 UTC. D = 2026-01-15 23:59 UTC.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "A",
    "settlement_stratum": "utc",
    "strata": {
      "condition": "utc",
      "frame_cluster": "clock-utc-0",
      "date": "2026-01-15",
      "zone": "Europe/London",
      "clock": "09:00",
      "utc_instant": "2026-01-15 09:00 UTC",
      "semantic_gold": "2026-01-15 09:00 UTC",
      "answer_options": {
        "A": "2026-01-15 09:00 UTC",
        "B": "not determined",
        "C": "2026-01-15 00:00 UTC",
        "D": "2026-01-15 23:59 UTC"
      }
    }
  },
  {
    "id": "clock-overnight-utc-1",
    "english": "The date of event ON-utc-1 is 2026-07-15. It is scheduled at 10:15 UTC.",
    "ainglish": "The date of event ON-utc-1 is 2026-07-15. It is scheduled at 10:15Z.",
    "question": "Which UTC instant is the event scheduled for? A = not determined. B = 2026-07-15 10:15 UTC. C = 2026-07-15 00:00 UTC. D = 2026-07-15 23:59 UTC.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "B",
    "settlement_stratum": "utc",
    "strata": {
      "condition": "utc",
      "frame_cluster": "clock-utc-1",
      "date": "2026-07-15",
      "zone": "Europe/London",
      "clock": "10:15",
      "utc_instant": "2026-07-15 10:15 UTC",
      "semantic_gold": "2026-07-15 10:15 UTC",
      "answer_options": {
        "A": "not determined",
        "B": "2026-07-15 10:15 UTC",
        "C": "2026-07-15 00:00 UTC",
        "D": "2026-07-15 23:59 UTC"
      }
    }
  },
  {
    "id": "clock-overnight-utc-2",
    "english": "The date of event ON-utc-2 is 2026-01-15. It is scheduled at 11:30 UTC.",
    "ainglish": "The date of event ON-utc-2 is 2026-01-15. It is scheduled at 11:30Z.",
    "question": "Which UTC instant is the event scheduled for? A = not determined. B = 2026-01-15 00:00 UTC. C = 2026-01-15 11:30 UTC. D = 2026-01-15 23:59 UTC.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "C",
    "settlement_stratum": "utc",
    "strata": {
      "condition": "utc",
      "frame_cluster": "clock-utc-2",
      "date": "2026-01-15",
      "zone": "America/New_York",
      "clock": "11:30",
      "utc_instant": "2026-01-15 11:30 UTC",
      "semantic_gold": "2026-01-15 11:30 UTC",
      "answer_options": {
        "A": "not determined",
        "B": "2026-01-15 00:00 UTC",
        "C": "2026-01-15 11:30 UTC",
        "D": "2026-01-15 23:59 UTC"
      }
    }
  },
  {
    "id": "clock-overnight-utc-3",
    "english": "The date of event ON-utc-3 is 2026-07-15. It is scheduled at 12:45 UTC.",
    "ainglish": "The date of event ON-utc-3 is 2026-07-15. It is scheduled at 12:45Z.",
    "question": "Which UTC instant is the event scheduled for? A = not determined. B = 2026-07-15 00:00 UTC. C = 2026-07-15 23:59 UTC. D = 2026-07-15 12:45 UTC.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "D",
    "settlement_stratum": "utc",
    "strata": {
      "condition": "utc",
      "frame_cluster": "clock-utc-3",
      "date": "2026-07-15",
      "zone": "America/New_York",
      "clock": "12:45",
      "utc_instant": "2026-07-15 12:45 UTC",
      "semantic_gold": "2026-07-15 12:45 UTC",
      "answer_options": {
        "A": "not determined",
        "B": "2026-07-15 00:00 UTC",
        "C": "2026-07-15 23:59 UTC",
        "D": "2026-07-15 12:45 UTC"
      }
    }
  },
  {
    "id": "clock-overnight-utc-4",
    "english": "The date of event ON-utc-4 is 2026-01-15. It is scheduled at 13:00 UTC.",
    "ainglish": "The date of event ON-utc-4 is 2026-01-15. It is scheduled at 13:00Z.",
    "question": "Which UTC instant is the event scheduled for? A = 2026-01-15 13:00 UTC. B = not determined. C = 2026-01-15 00:00 UTC. D = 2026-01-15 23:59 UTC.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "A",
    "settlement_stratum": "utc",
    "strata": {
      "condition": "utc",
      "frame_cluster": "clock-utc-4",
      "date": "2026-01-15",
      "zone": "Asia/Kolkata",
      "clock": "13:00",
      "utc_instant": "2026-01-15 13:00 UTC",
      "semantic_gold": "2026-01-15 13:00 UTC",
      "answer_options": {
        "A": "2026-01-15 13:00 UTC",
        "B": "not determined",
        "C": "2026-01-15 00:00 UTC",
        "D": "2026-01-15 23:59 UTC"
      }
    }
  },
  {
    "id": "clock-overnight-utc-5",
    "english": "The date of event ON-utc-5 is 2026-07-15. It is scheduled at 09:15 UTC.",
    "ainglish": "The date of event ON-utc-5 is 2026-07-15. It is scheduled at 09:15Z.",
    "question": "Which UTC instant is the event scheduled for? A = not determined. B = 2026-07-15 09:15 UTC. C = 2026-07-15 00:00 UTC. D = 2026-07-15 23:59 UTC.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "B",
    "settlement_stratum": "utc",
    "strata": {
      "condition": "utc",
      "frame_cluster": "clock-utc-5",
      "date": "2026-07-15",
      "zone": "Asia/Kolkata",
      "clock": "09:15",
      "utc_instant": "2026-07-15 09:15 UTC",
      "semantic_gold": "2026-07-15 09:15 UTC",
      "answer_options": {
        "A": "not determined",
        "B": "2026-07-15 09:15 UTC",
        "C": "2026-07-15 00:00 UTC",
        "D": "2026-07-15 23:59 UTC"
      }
    }
  },
  {
    "id": "clock-overnight-utc-6",
    "english": "The date of event ON-utc-6 is 2026-01-15. It is scheduled at 10:30 UTC.",
    "ainglish": "The date of event ON-utc-6 is 2026-01-15. It is scheduled at 10:30Z.",
    "question": "Which UTC instant is the event scheduled for? A = not determined. B = 2026-01-15 00:00 UTC. C = 2026-01-15 10:30 UTC. D = 2026-01-15 23:59 UTC.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "C",
    "settlement_stratum": "utc",
    "strata": {
      "condition": "utc",
      "frame_cluster": "clock-utc-6",
      "date": "2026-01-15",
      "zone": "Australia/Sydney",
      "clock": "10:30",
      "utc_instant": "2026-01-15 10:30 UTC",
      "semantic_gold": "2026-01-15 10:30 UTC",
      "answer_options": {
        "A": "not determined",
        "B": "2026-01-15 00:00 UTC",
        "C": "2026-01-15 10:30 UTC",
        "D": "2026-01-15 23:59 UTC"
      }
    }
  },
  {
    "id": "clock-overnight-utc-7",
    "english": "The date of event ON-utc-7 is 2026-07-15. It is scheduled at 11:45 UTC.",
    "ainglish": "The date of event ON-utc-7 is 2026-07-15. It is scheduled at 11:45Z.",
    "question": "Which UTC instant is the event scheduled for? A = not determined. B = 2026-07-15 00:00 UTC. C = 2026-07-15 23:59 UTC. D = 2026-07-15 11:45 UTC.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "D",
    "settlement_stratum": "utc",
    "strata": {
      "condition": "utc",
      "frame_cluster": "clock-utc-7",
      "date": "2026-07-15",
      "zone": "Australia/Sydney",
      "clock": "11:45",
      "utc_instant": "2026-07-15 11:45 UTC",
      "semantic_gold": "2026-07-15 11:45 UTC",
      "answer_options": {
        "A": "not determined",
        "B": "2026-07-15 00:00 UTC",
        "C": "2026-07-15 23:59 UTC",
        "D": "2026-07-15 11:45 UTC"
      }
    }
  },
  {
    "id": "clock-overnight-utc-8",
    "english": "The date of event ON-utc-8 is 2026-01-15. It is scheduled at 12:00 UTC.",
    "ainglish": "The date of event ON-utc-8 is 2026-01-15. It is scheduled at 12:00Z.",
    "question": "Which UTC instant is the event scheduled for? A = 2026-01-15 12:00 UTC. B = not determined. C = 2026-01-15 00:00 UTC. D = 2026-01-15 23:59 UTC.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "A",
    "settlement_stratum": "utc",
    "strata": {
      "condition": "utc",
      "frame_cluster": "clock-utc-8",
      "date": "2026-01-15",
      "zone": "Europe/London",
      "clock": "12:00",
      "utc_instant": "2026-01-15 12:00 UTC",
      "semantic_gold": "2026-01-15 12:00 UTC",
      "answer_options": {
        "A": "2026-01-15 12:00 UTC",
        "B": "not determined",
        "C": "2026-01-15 00:00 UTC",
        "D": "2026-01-15 23:59 UTC"
      }
    }
  },
  {
    "id": "clock-overnight-utc-9",
    "english": "The date of event ON-utc-9 is 2026-07-15. It is scheduled at 13:15 UTC.",
    "ainglish": "The date of event ON-utc-9 is 2026-07-15. It is scheduled at 13:15Z.",
    "question": "Which UTC instant is the event scheduled for? A = not determined. B = 2026-07-15 13:15 UTC. C = 2026-07-15 00:00 UTC. D = 2026-07-15 23:59 UTC.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "B",
    "settlement_stratum": "utc",
    "strata": {
      "condition": "utc",
      "frame_cluster": "clock-utc-9",
      "date": "2026-07-15",
      "zone": "Europe/London",
      "clock": "13:15",
      "utc_instant": "2026-07-15 13:15 UTC",
      "semantic_gold": "2026-07-15 13:15 UTC",
      "answer_options": {
        "A": "not determined",
        "B": "2026-07-15 13:15 UTC",
        "C": "2026-07-15 00:00 UTC",
        "D": "2026-07-15 23:59 UTC"
      }
    }
  },
  {
    "id": "clock-overnight-utc-10",
    "english": "The date of event ON-utc-10 is 2026-01-15. It is scheduled at 09:30 UTC.",
    "ainglish": "The date of event ON-utc-10 is 2026-01-15. It is scheduled at 09:30Z.",
    "question": "Which UTC instant is the event scheduled for? A = not determined. B = 2026-01-15 00:00 UTC. C = 2026-01-15 09:30 UTC. D = 2026-01-15 23:59 UTC.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "C",
    "settlement_stratum": "utc",
    "strata": {
      "condition": "utc",
      "frame_cluster": "clock-utc-10",
      "date": "2026-01-15",
      "zone": "America/New_York",
      "clock": "09:30",
      "utc_instant": "2026-01-15 09:30 UTC",
      "semantic_gold": "2026-01-15 09:30 UTC",
      "answer_options": {
        "A": "not determined",
        "B": "2026-01-15 00:00 UTC",
        "C": "2026-01-15 09:30 UTC",
        "D": "2026-01-15 23:59 UTC"
      }
    }
  },
  {
    "id": "clock-overnight-utc-11",
    "english": "The date of event ON-utc-11 is 2026-07-15. It is scheduled at 10:45 UTC.",
    "ainglish": "The date of event ON-utc-11 is 2026-07-15. It is scheduled at 10:45Z.",
    "question": "Which UTC instant is the event scheduled for? A = not determined. B = 2026-07-15 00:00 UTC. C = 2026-07-15 23:59 UTC. D = 2026-07-15 10:45 UTC.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "D",
    "settlement_stratum": "utc",
    "strata": {
      "condition": "utc",
      "frame_cluster": "clock-utc-11",
      "date": "2026-07-15",
      "zone": "America/New_York",
      "clock": "10:45",
      "utc_instant": "2026-07-15 10:45 UTC",
      "semantic_gold": "2026-07-15 10:45 UTC",
      "answer_options": {
        "A": "not determined",
        "B": "2026-07-15 00:00 UTC",
        "C": "2026-07-15 23:59 UTC",
        "D": "2026-07-15 10:45 UTC"
      }
    }
  },
  {
    "id": "clock-overnight-utc-12",
    "english": "The date of event ON-utc-12 is 2026-01-15. It is scheduled at 11:00 UTC.",
    "ainglish": "The date of event ON-utc-12 is 2026-01-15. It is scheduled at 11:00Z.",
    "question": "Which UTC instant is the event scheduled for? A = 2026-01-15 11:00 UTC. B = not determined. C = 2026-01-15 00:00 UTC. D = 2026-01-15 23:59 UTC.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "A",
    "settlement_stratum": "utc",
    "strata": {
      "condition": "utc",
      "frame_cluster": "clock-utc-12",
      "date": "2026-01-15",
      "zone": "Asia/Kolkata",
      "clock": "11:00",
      "utc_instant": "2026-01-15 11:00 UTC",
      "semantic_gold": "2026-01-15 11:00 UTC",
      "answer_options": {
        "A": "2026-01-15 11:00 UTC",
        "B": "not determined",
        "C": "2026-01-15 00:00 UTC",
        "D": "2026-01-15 23:59 UTC"
      }
    }
  },
  {
    "id": "clock-overnight-utc-13",
    "english": "The date of event ON-utc-13 is 2026-07-15. It is scheduled at 12:15 UTC.",
    "ainglish": "The date of event ON-utc-13 is 2026-07-15. It is scheduled at 12:15Z.",
    "question": "Which UTC instant is the event scheduled for? A = not determined. B = 2026-07-15 12:15 UTC. C = 2026-07-15 00:00 UTC. D = 2026-07-15 23:59 UTC.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "B",
    "settlement_stratum": "utc",
    "strata": {
      "condition": "utc",
      "frame_cluster": "clock-utc-13",
      "date": "2026-07-15",
      "zone": "Asia/Kolkata",
      "clock": "12:15",
      "utc_instant": "2026-07-15 12:15 UTC",
      "semantic_gold": "2026-07-15 12:15 UTC",
      "answer_options": {
        "A": "not determined",
        "B": "2026-07-15 12:15 UTC",
        "C": "2026-07-15 00:00 UTC",
        "D": "2026-07-15 23:59 UTC"
      }
    }
  },
  {
    "id": "clock-overnight-utc-14",
    "english": "The date of event ON-utc-14 is 2026-01-15. It is scheduled at 13:30 UTC.",
    "ainglish": "The date of event ON-utc-14 is 2026-01-15. It is scheduled at 13:30Z.",
    "question": "Which UTC instant is the event scheduled for? A = not determined. B = 2026-01-15 00:00 UTC. C = 2026-01-15 13:30 UTC. D = 2026-01-15 23:59 UTC.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "C",
    "settlement_stratum": "utc",
    "strata": {
      "condition": "utc",
      "frame_cluster": "clock-utc-14",
      "date": "2026-01-15",
      "zone": "Australia/Sydney",
      "clock": "13:30",
      "utc_instant": "2026-01-15 13:30 UTC",
      "semantic_gold": "2026-01-15 13:30 UTC",
      "answer_options": {
        "A": "not determined",
        "B": "2026-01-15 00:00 UTC",
        "C": "2026-01-15 13:30 UTC",
        "D": "2026-01-15 23:59 UTC"
      }
    }
  },
  {
    "id": "clock-overnight-utc-15",
    "english": "The date of event ON-utc-15 is 2026-07-15. It is scheduled at 09:45 UTC.",
    "ainglish": "The date of event ON-utc-15 is 2026-07-15. It is scheduled at 09:45Z.",
    "question": "Which UTC instant is the event scheduled for? A = not determined. B = 2026-07-15 00:00 UTC. C = 2026-07-15 23:59 UTC. D = 2026-07-15 09:45 UTC.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "D",
    "settlement_stratum": "utc",
    "strata": {
      "condition": "utc",
      "frame_cluster": "clock-utc-15",
      "date": "2026-07-15",
      "zone": "Australia/Sydney",
      "clock": "09:45",
      "utc_instant": "2026-07-15 09:45 UTC",
      "semantic_gold": "2026-07-15 09:45 UTC",
      "answer_options": {
        "A": "not determined",
        "B": "2026-07-15 00:00 UTC",
        "C": "2026-07-15 23:59 UTC",
        "D": "2026-07-15 09:45 UTC"
      }
    }
  },
  {
    "id": "clock-overnight-civil-0",
    "english": "The date of event ON-civil-0 is 2026-01-15. It is scheduled at 09:00 civil time in Europe/London, using the offset applicable on that date.",
    "ainglish": "The date of event ON-civil-0 is 2026-01-15. It is scheduled at 09:00@Europe/London.",
    "question": "Which UTC instant is the event scheduled for? A = 2026-01-15 09:00 UTC. B = not determined. C = 2026-01-15 00:00 UTC. D = 2026-01-15 23:59 UTC.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "A",
    "settlement_stratum": "civil",
    "strata": {
      "condition": "civil",
      "frame_cluster": "clock-civil-0",
      "date": "2026-01-15",
      "zone": "Europe/London",
      "clock": "09:00",
      "utc_instant": "2026-01-15 09:00 UTC",
      "semantic_gold": "2026-01-15 09:00 UTC",
      "answer_options": {
        "A": "2026-01-15 09:00 UTC",
        "B": "not determined",
        "C": "2026-01-15 00:00 UTC",
        "D": "2026-01-15 23:59 UTC"
      }
    }
  },
  {
    "id": "clock-overnight-civil-1",
    "english": "The date of event ON-civil-1 is 2026-07-15. It is scheduled at 10:15 civil time in Europe/London, using the offset applicable on that date.",
    "ainglish": "The date of event ON-civil-1 is 2026-07-15. It is scheduled at 10:15@Europe/London.",
    "question": "Which UTC instant is the event scheduled for? A = not determined. B = 2026-07-15 09:15 UTC. C = 2026-07-15 00:00 UTC. D = 2026-07-15 23:59 UTC.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "B",
    "settlement_stratum": "civil",
    "strata": {
      "condition": "civil",
      "frame_cluster": "clock-civil-1",
      "date": "2026-07-15",
      "zone": "Europe/London",
      "clock": "10:15",
      "utc_instant": "2026-07-15 09:15 UTC",
      "semantic_gold": "2026-07-15 09:15 UTC",
      "answer_options": {
        "A": "not determined",
        "B": "2026-07-15 09:15 UTC",
        "C": "2026-07-15 00:00 UTC",
        "D": "2026-07-15 23:59 UTC"
      }
    }
  },
  {
    "id": "clock-overnight-civil-2",
    "english": "The date of event ON-civil-2 is 2026-01-15. It is scheduled at 11:30 civil time in America/New_York, using the offset applicable on that date.",
    "ainglish": "The date of event ON-civil-2 is 2026-01-15. It is scheduled at 11:30@America/New_York.",
    "question": "Which UTC instant is the event scheduled for? A = not determined. B = 2026-01-15 00:00 UTC. C = 2026-01-15 16:30 UTC. D = 2026-01-15 23:59 UTC.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "C",
    "settlement_stratum": "civil",
    "strata": {
      "condition": "civil",
      "frame_cluster": "clock-civil-2",
      "date": "2026-01-15",
      "zone": "America/New_York",
      "clock": "11:30",
      "utc_instant": "2026-01-15 16:30 UTC",
      "semantic_gold": "2026-01-15 16:30 UTC",
      "answer_options": {
        "A": "not determined",
        "B": "2026-01-15 00:00 UTC",
        "C": "2026-01-15 16:30 UTC",
        "D": "2026-01-15 23:59 UTC"
      }
    }
  },
  {
    "id": "clock-overnight-civil-3",
    "english": "The date of event ON-civil-3 is 2026-07-15. It is scheduled at 12:45 civil time in America/New_York, using the offset applicable on that date.",
    "ainglish": "The date of event ON-civil-3 is 2026-07-15. It is scheduled at 12:45@America/New_York.",
    "question": "Which UTC instant is the event scheduled for? A = not determined. B = 2026-07-15 00:00 UTC. C = 2026-07-15 23:59 UTC. D = 2026-07-15 16:45 UTC.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "D",
    "settlement_stratum": "civil",
    "strata": {
      "condition": "civil",
      "frame_cluster": "clock-civil-3",
      "date": "2026-07-15",
      "zone": "America/New_York",
      "clock": "12:45",
      "utc_instant": "2026-07-15 16:45 UTC",
      "semantic_gold": "2026-07-15 16:45 UTC",
      "answer_options": {
        "A": "not determined",
        "B": "2026-07-15 00:00 UTC",
        "C": "2026-07-15 23:59 UTC",
        "D": "2026-07-15 16:45 UTC"
      }
    }
  },
  {
    "id": "clock-overnight-civil-4",
    "english": "The date of event ON-civil-4 is 2026-01-15. It is scheduled at 13:00 civil time in Asia/Kolkata, using the offset applicable on that date.",
    "ainglish": "The date of event ON-civil-4 is 2026-01-15. It is scheduled at 13:00@Asia/Kolkata.",
    "question": "Which UTC instant is the event scheduled for? A = 2026-01-15 07:30 UTC. B = not determined. C = 2026-01-15 00:00 UTC. D = 2026-01-15 23:59 UTC.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "A",
    "settlement_stratum": "civil",
    "strata": {
      "condition": "civil",
      "frame_cluster": "clock-civil-4",
      "date": "2026-01-15",
      "zone": "Asia/Kolkata",
      "clock": "13:00",
      "utc_instant": "2026-01-15 07:30 UTC",
      "semantic_gold": "2026-01-15 07:30 UTC",
      "answer_options": {
        "A": "2026-01-15 07:30 UTC",
        "B": "not determined",
        "C": "2026-01-15 00:00 UTC",
        "D": "2026-01-15 23:59 UTC"
      }
    }
  },
  {
    "id": "clock-overnight-civil-5",
    "english": "The date of event ON-civil-5 is 2026-07-15. It is scheduled at 09:15 civil time in Asia/Kolkata, using the offset applicable on that date.",
    "ainglish": "The date of event ON-civil-5 is 2026-07-15. It is scheduled at 09:15@Asia/Kolkata.",
    "question": "Which UTC instant is the event scheduled for? A = not determined. B = 2026-07-15 03:45 UTC. C = 2026-07-15 00:00 UTC. D = 2026-07-15 23:59 UTC.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "B",
    "settlement_stratum": "civil",
    "strata": {
      "condition": "civil",
      "frame_cluster": "clock-civil-5",
      "date": "2026-07-15",
      "zone": "Asia/Kolkata",
      "clock": "09:15",
      "utc_instant": "2026-07-15 03:45 UTC",
      "semantic_gold": "2026-07-15 03:45 UTC",
      "answer_options": {
        "A": "not determined",
        "B": "2026-07-15 03:45 UTC",
        "C": "2026-07-15 00:00 UTC",
        "D": "2026-07-15 23:59 UTC"
      }
    }
  },
  {
    "id": "clock-overnight-civil-6",
    "english": "The date of event ON-civil-6 is 2026-01-15. It is scheduled at 10:30 civil time in Australia/Sydney, using the offset applicable on that date.",
    "ainglish": "The date of event ON-civil-6 is 2026-01-15. It is scheduled at 10:30@Australia/Sydney.",
    "question": "Which UTC instant is the event scheduled for? A = not determined. B = 2026-01-15 00:00 UTC. C = 2026-01-14 23:30 UTC. D = 2026-01-15 23:59 UTC.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "C",
    "settlement_stratum": "civil",
    "strata": {
      "condition": "civil",
      "frame_cluster": "clock-civil-6",
      "date": "2026-01-15",
      "zone": "Australia/Sydney",
      "clock": "10:30",
      "utc_instant": "2026-01-14 23:30 UTC",
      "semantic_gold": "2026-01-14 23:30 UTC",
      "answer_options": {
        "A": "not determined",
        "B": "2026-01-15 00:00 UTC",
        "C": "2026-01-14 23:30 UTC",
        "D": "2026-01-15 23:59 UTC"
      }
    }
  },
  {
    "id": "clock-overnight-civil-7",
    "english": "The date of event ON-civil-7 is 2026-07-15. It is scheduled at 11:45 civil time in Australia/Sydney, using the offset applicable on that date.",
    "ainglish": "The date of event ON-civil-7 is 2026-07-15. It is scheduled at 11:45@Australia/Sydney.",
    "question": "Which UTC instant is the event scheduled for? A = not determined. B = 2026-07-15 00:00 UTC. C = 2026-07-15 23:59 UTC. D = 2026-07-15 01:45 UTC.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "D",
    "settlement_stratum": "civil",
    "strata": {
      "condition": "civil",
      "frame_cluster": "clock-civil-7",
      "date": "2026-07-15",
      "zone": "Australia/Sydney",
      "clock": "11:45",
      "utc_instant": "2026-07-15 01:45 UTC",
      "semantic_gold": "2026-07-15 01:45 UTC",
      "answer_options": {
        "A": "not determined",
        "B": "2026-07-15 00:00 UTC",
        "C": "2026-07-15 23:59 UTC",
        "D": "2026-07-15 01:45 UTC"
      }
    }
  },
  {
    "id": "clock-overnight-civil-8",
    "english": "The date of event ON-civil-8 is 2026-01-15. It is scheduled at 12:00 civil time in Europe/London, using the offset applicable on that date.",
    "ainglish": "The date of event ON-civil-8 is 2026-01-15. It is scheduled at 12:00@Europe/London.",
    "question": "Which UTC instant is the event scheduled for? A = 2026-01-15 12:00 UTC. B = not determined. C = 2026-01-15 00:00 UTC. D = 2026-01-15 23:59 UTC.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "A",
    "settlement_stratum": "civil",
    "strata": {
      "condition": "civil",
      "frame_cluster": "clock-civil-8",
      "date": "2026-01-15",
      "zone": "Europe/London",
      "clock": "12:00",
      "utc_instant": "2026-01-15 12:00 UTC",
      "semantic_gold": "2026-01-15 12:00 UTC",
      "answer_options": {
        "A": "2026-01-15 12:00 UTC",
        "B": "not determined",
        "C": "2026-01-15 00:00 UTC",
        "D": "2026-01-15 23:59 UTC"
      }
    }
  },
  {
    "id": "clock-overnight-civil-9",
    "english": "The date of event ON-civil-9 is 2026-07-15. It is scheduled at 13:15 civil time in Europe/London, using the offset applicable on that date.",
    "ainglish": "The date of event ON-civil-9 is 2026-07-15. It is scheduled at 13:15@Europe/London.",
    "question": "Which UTC instant is the event scheduled for? A = not determined. B = 2026-07-15 12:15 UTC. C = 2026-07-15 00:00 UTC. D = 2026-07-15 23:59 UTC.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "B",
    "settlement_stratum": "civil",
    "strata": {
      "condition": "civil",
      "frame_cluster": "clock-civil-9",
      "date": "2026-07-15",
      "zone": "Europe/London",
      "clock": "13:15",
      "utc_instant": "2026-07-15 12:15 UTC",
      "semantic_gold": "2026-07-15 12:15 UTC",
      "answer_options": {
        "A": "not determined",
        "B": "2026-07-15 12:15 UTC",
        "C": "2026-07-15 00:00 UTC",
        "D": "2026-07-15 23:59 UTC"
      }
    }
  },
  {
    "id": "clock-overnight-civil-10",
    "english": "The date of event ON-civil-10 is 2026-01-15. It is scheduled at 09:30 civil time in America/New_York, using the offset applicable on that date.",
    "ainglish": "The date of event ON-civil-10 is 2026-01-15. It is scheduled at 09:30@America/New_York.",
    "question": "Which UTC instant is the event scheduled for? A = not determined. B = 2026-01-15 00:00 UTC. C = 2026-01-15 14:30 UTC. D = 2026-01-15 23:59 UTC.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "C",
    "settlement_stratum": "civil",
    "strata": {
      "condition": "civil",
      "frame_cluster": "clock-civil-10",
      "date": "2026-01-15",
      "zone": "America/New_York",
      "clock": "09:30",
      "utc_instant": "2026-01-15 14:30 UTC",
      "semantic_gold": "2026-01-15 14:30 UTC",
      "answer_options": {
        "A": "not determined",
        "B": "2026-01-15 00:00 UTC",
        "C": "2026-01-15 14:30 UTC",
        "D": "2026-01-15 23:59 UTC"
      }
    }
  },
  {
    "id": "clock-overnight-civil-11",
    "english": "The date of event ON-civil-11 is 2026-07-15. It is scheduled at 10:45 civil time in America/New_York, using the offset applicable on that date.",
    "ainglish": "The date of event ON-civil-11 is 2026-07-15. It is scheduled at 10:45@America/New_York.",
    "question": "Which UTC instant is the event scheduled for? A = not determined. B = 2026-07-15 00:00 UTC. C = 2026-07-15 23:59 UTC. D = 2026-07-15 14:45 UTC.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "D",
    "settlement_stratum": "civil",
    "strata": {
      "condition": "civil",
      "frame_cluster": "clock-civil-11",
      "date": "2026-07-15",
      "zone": "America/New_York",
      "clock": "10:45",
      "utc_instant": "2026-07-15 14:45 UTC",
      "semantic_gold": "2026-07-15 14:45 UTC",
      "answer_options": {
        "A": "not determined",
        "B": "2026-07-15 00:00 UTC",
        "C": "2026-07-15 23:59 UTC",
        "D": "2026-07-15 14:45 UTC"
      }
    }
  },
  {
    "id": "clock-overnight-civil-12",
    "english": "The date of event ON-civil-12 is 2026-01-15. It is scheduled at 11:00 civil time in Asia/Kolkata, using the offset applicable on that date.",
    "ainglish": "The date of event ON-civil-12 is 2026-01-15. It is scheduled at 11:00@Asia/Kolkata.",
    "question": "Which UTC instant is the event scheduled for? A = 2026-01-15 05:30 UTC. B = not determined. C = 2026-01-15 00:00 UTC. D = 2026-01-15 23:59 UTC.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "A",
    "settlement_stratum": "civil",
    "strata": {
      "condition": "civil",
      "frame_cluster": "clock-civil-12",
      "date": "2026-01-15",
      "zone": "Asia/Kolkata",
      "clock": "11:00",
      "utc_instant": "2026-01-15 05:30 UTC",
      "semantic_gold": "2026-01-15 05:30 UTC",
      "answer_options": {
        "A": "2026-01-15 05:30 UTC",
        "B": "not determined",
        "C": "2026-01-15 00:00 UTC",
        "D": "2026-01-15 23:59 UTC"
      }
    }
  },
  {
    "id": "clock-overnight-civil-13",
    "english": "The date of event ON-civil-13 is 2026-07-15. It is scheduled at 12:15 civil time in Asia/Kolkata, using the offset applicable on that date.",
    "ainglish": "The date of event ON-civil-13 is 2026-07-15. It is scheduled at 12:15@Asia/Kolkata.",
    "question": "Which UTC instant is the event scheduled for? A = not determined. B = 2026-07-15 06:45 UTC. C = 2026-07-15 00:00 UTC. D = 2026-07-15 23:59 UTC.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "B",
    "settlement_stratum": "civil",
    "strata": {
      "condition": "civil",
      "frame_cluster": "clock-civil-13",
      "date": "2026-07-15",
      "zone": "Asia/Kolkata",
      "clock": "12:15",
      "utc_instant": "2026-07-15 06:45 UTC",
      "semantic_gold": "2026-07-15 06:45 UTC",
      "answer_options": {
        "A": "not determined",
        "B": "2026-07-15 06:45 UTC",
        "C": "2026-07-15 00:00 UTC",
        "D": "2026-07-15 23:59 UTC"
      }
    }
  },
  {
    "id": "clock-overnight-civil-14",
    "english": "The date of event ON-civil-14 is 2026-01-15. It is scheduled at 13:30 civil time in Australia/Sydney, using the offset applicable on that date.",
    "ainglish": "The date of event ON-civil-14 is 2026-01-15. It is scheduled at 13:30@Australia/Sydney.",
    "question": "Which UTC instant is the event scheduled for? A = not determined. B = 2026-01-15 00:00 UTC. C = 2026-01-15 02:30 UTC. D = 2026-01-15 23:59 UTC.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "C",
    "settlement_stratum": "civil",
    "strata": {
      "condition": "civil",
      "frame_cluster": "clock-civil-14",
      "date": "2026-01-15",
      "zone": "Australia/Sydney",
      "clock": "13:30",
      "utc_instant": "2026-01-15 02:30 UTC",
      "semantic_gold": "2026-01-15 02:30 UTC",
      "answer_options": {
        "A": "not determined",
        "B": "2026-01-15 00:00 UTC",
        "C": "2026-01-15 02:30 UTC",
        "D": "2026-01-15 23:59 UTC"
      }
    }
  },
  {
    "id": "clock-overnight-civil-15",
    "english": "The date of event ON-civil-15 is 2026-07-15. It is scheduled at 09:45 civil time in Australia/Sydney, using the offset applicable on that date.",
    "ainglish": "The date of event ON-civil-15 is 2026-07-15. It is scheduled at 09:45@Australia/Sydney.",
    "question": "Which UTC instant is the event scheduled for? A = not determined. B = 2026-07-15 00:00 UTC. C = 2026-07-15 23:59 UTC. D = 2026-07-14 23:45 UTC.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "D",
    "settlement_stratum": "civil",
    "strata": {
      "condition": "civil",
      "frame_cluster": "clock-civil-15",
      "date": "2026-07-15",
      "zone": "Australia/Sydney",
      "clock": "09:45",
      "utc_instant": "2026-07-14 23:45 UTC",
      "semantic_gold": "2026-07-14 23:45 UTC",
      "answer_options": {
        "A": "not determined",
        "B": "2026-07-15 00:00 UTC",
        "C": "2026-07-15 23:59 UTC",
        "D": "2026-07-14 23:45 UTC"
      }
    }
  },
  {
    "id": "clock-overnight-missing-date-utc-0",
    "english": "A single future event ON-missing-date-utc-0 is mentioned. No date, recurrence or other dating context is supplied. Time: 09:00 UTC.",
    "ainglish": "A single future event ON-missing-date-utc-0 is mentioned. No date, recurrence or other dating context is supplied. Time: 09:00Z.",
    "question": "Does this message identify one unique dated instant? A = no unique dated instant. B = yes, exactly one instant. C = yes, always today. D = yes, always tomorrow.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "A",
    "settlement_stratum": "missing-date-utc",
    "strata": {
      "condition": "missing-date-utc",
      "frame_cluster": "clock-missing-date-utc-0",
      "date": "2026-01-15",
      "zone": "Europe/London",
      "clock": "09:00",
      "semantic_gold": "no unique dated instant",
      "answer_options": {
        "A": "no unique dated instant",
        "B": "yes, exactly one instant",
        "C": "yes, always today",
        "D": "yes, always tomorrow"
      }
    }
  },
  {
    "id": "clock-overnight-missing-date-utc-1",
    "english": "A single future event ON-missing-date-utc-1 is mentioned. No date, recurrence or other dating context is supplied. Time: 10:15 UTC.",
    "ainglish": "A single future event ON-missing-date-utc-1 is mentioned. No date, recurrence or other dating context is supplied. Time: 10:15Z.",
    "question": "Does this message identify one unique dated instant? A = yes, exactly one instant. B = no unique dated instant. C = yes, always today. D = yes, always tomorrow.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "B",
    "settlement_stratum": "missing-date-utc",
    "strata": {
      "condition": "missing-date-utc",
      "frame_cluster": "clock-missing-date-utc-1",
      "date": "2026-07-15",
      "zone": "Europe/London",
      "clock": "10:15",
      "semantic_gold": "no unique dated instant",
      "answer_options": {
        "A": "yes, exactly one instant",
        "B": "no unique dated instant",
        "C": "yes, always today",
        "D": "yes, always tomorrow"
      }
    }
  },
  {
    "id": "clock-overnight-missing-date-utc-2",
    "english": "A single future event ON-missing-date-utc-2 is mentioned. No date, recurrence or other dating context is supplied. Time: 11:30 UTC.",
    "ainglish": "A single future event ON-missing-date-utc-2 is mentioned. No date, recurrence or other dating context is supplied. Time: 11:30Z.",
    "question": "Does this message identify one unique dated instant? A = yes, exactly one instant. B = yes, always today. C = no unique dated instant. D = yes, always tomorrow.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "C",
    "settlement_stratum": "missing-date-utc",
    "strata": {
      "condition": "missing-date-utc",
      "frame_cluster": "clock-missing-date-utc-2",
      "date": "2026-01-15",
      "zone": "America/New_York",
      "clock": "11:30",
      "semantic_gold": "no unique dated instant",
      "answer_options": {
        "A": "yes, exactly one instant",
        "B": "yes, always today",
        "C": "no unique dated instant",
        "D": "yes, always tomorrow"
      }
    }
  },
  {
    "id": "clock-overnight-missing-date-utc-3",
    "english": "A single future event ON-missing-date-utc-3 is mentioned. No date, recurrence or other dating context is supplied. Time: 12:45 UTC.",
    "ainglish": "A single future event ON-missing-date-utc-3 is mentioned. No date, recurrence or other dating context is supplied. Time: 12:45Z.",
    "question": "Does this message identify one unique dated instant? A = yes, exactly one instant. B = yes, always today. C = yes, always tomorrow. D = no unique dated instant.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "D",
    "settlement_stratum": "missing-date-utc",
    "strata": {
      "condition": "missing-date-utc",
      "frame_cluster": "clock-missing-date-utc-3",
      "date": "2026-07-15",
      "zone": "America/New_York",
      "clock": "12:45",
      "semantic_gold": "no unique dated instant",
      "answer_options": {
        "A": "yes, exactly one instant",
        "B": "yes, always today",
        "C": "yes, always tomorrow",
        "D": "no unique dated instant"
      }
    }
  },
  {
    "id": "clock-overnight-missing-date-utc-4",
    "english": "A single future event ON-missing-date-utc-4 is mentioned. No date, recurrence or other dating context is supplied. Time: 13:00 UTC.",
    "ainglish": "A single future event ON-missing-date-utc-4 is mentioned. No date, recurrence or other dating context is supplied. Time: 13:00Z.",
    "question": "Does this message identify one unique dated instant? A = no unique dated instant. B = yes, exactly one instant. C = yes, always today. D = yes, always tomorrow.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "A",
    "settlement_stratum": "missing-date-utc",
    "strata": {
      "condition": "missing-date-utc",
      "frame_cluster": "clock-missing-date-utc-4",
      "date": "2026-01-15",
      "zone": "Asia/Kolkata",
      "clock": "13:00",
      "semantic_gold": "no unique dated instant",
      "answer_options": {
        "A": "no unique dated instant",
        "B": "yes, exactly one instant",
        "C": "yes, always today",
        "D": "yes, always tomorrow"
      }
    }
  },
  {
    "id": "clock-overnight-missing-date-utc-5",
    "english": "A single future event ON-missing-date-utc-5 is mentioned. No date, recurrence or other dating context is supplied. Time: 09:15 UTC.",
    "ainglish": "A single future event ON-missing-date-utc-5 is mentioned. No date, recurrence or other dating context is supplied. Time: 09:15Z.",
    "question": "Does this message identify one unique dated instant? A = yes, exactly one instant. B = no unique dated instant. C = yes, always today. D = yes, always tomorrow.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "B",
    "settlement_stratum": "missing-date-utc",
    "strata": {
      "condition": "missing-date-utc",
      "frame_cluster": "clock-missing-date-utc-5",
      "date": "2026-07-15",
      "zone": "Asia/Kolkata",
      "clock": "09:15",
      "semantic_gold": "no unique dated instant",
      "answer_options": {
        "A": "yes, exactly one instant",
        "B": "no unique dated instant",
        "C": "yes, always today",
        "D": "yes, always tomorrow"
      }
    }
  },
  {
    "id": "clock-overnight-missing-date-utc-6",
    "english": "A single future event ON-missing-date-utc-6 is mentioned. No date, recurrence or other dating context is supplied. Time: 10:30 UTC.",
    "ainglish": "A single future event ON-missing-date-utc-6 is mentioned. No date, recurrence or other dating context is supplied. Time: 10:30Z.",
    "question": "Does this message identify one unique dated instant? A = yes, exactly one instant. B = yes, always today. C = no unique dated instant. D = yes, always tomorrow.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "C",
    "settlement_stratum": "missing-date-utc",
    "strata": {
      "condition": "missing-date-utc",
      "frame_cluster": "clock-missing-date-utc-6",
      "date": "2026-01-15",
      "zone": "Australia/Sydney",
      "clock": "10:30",
      "semantic_gold": "no unique dated instant",
      "answer_options": {
        "A": "yes, exactly one instant",
        "B": "yes, always today",
        "C": "no unique dated instant",
        "D": "yes, always tomorrow"
      }
    }
  },
  {
    "id": "clock-overnight-missing-date-utc-7",
    "english": "A single future event ON-missing-date-utc-7 is mentioned. No date, recurrence or other dating context is supplied. Time: 11:45 UTC.",
    "ainglish": "A single future event ON-missing-date-utc-7 is mentioned. No date, recurrence or other dating context is supplied. Time: 11:45Z.",
    "question": "Does this message identify one unique dated instant? A = yes, exactly one instant. B = yes, always today. C = yes, always tomorrow. D = no unique dated instant.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "D",
    "settlement_stratum": "missing-date-utc",
    "strata": {
      "condition": "missing-date-utc",
      "frame_cluster": "clock-missing-date-utc-7",
      "date": "2026-07-15",
      "zone": "Australia/Sydney",
      "clock": "11:45",
      "semantic_gold": "no unique dated instant",
      "answer_options": {
        "A": "yes, exactly one instant",
        "B": "yes, always today",
        "C": "yes, always tomorrow",
        "D": "no unique dated instant"
      }
    }
  },
  {
    "id": "clock-overnight-missing-date-utc-8",
    "english": "A single future event ON-missing-date-utc-8 is mentioned. No date, recurrence or other dating context is supplied. Time: 12:00 UTC.",
    "ainglish": "A single future event ON-missing-date-utc-8 is mentioned. No date, recurrence or other dating context is supplied. Time: 12:00Z.",
    "question": "Does this message identify one unique dated instant? A = no unique dated instant. B = yes, exactly one instant. C = yes, always today. D = yes, always tomorrow.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "A",
    "settlement_stratum": "missing-date-utc",
    "strata": {
      "condition": "missing-date-utc",
      "frame_cluster": "clock-missing-date-utc-8",
      "date": "2026-01-15",
      "zone": "Europe/London",
      "clock": "12:00",
      "semantic_gold": "no unique dated instant",
      "answer_options": {
        "A": "no unique dated instant",
        "B": "yes, exactly one instant",
        "C": "yes, always today",
        "D": "yes, always tomorrow"
      }
    }
  },
  {
    "id": "clock-overnight-missing-date-utc-9",
    "english": "A single future event ON-missing-date-utc-9 is mentioned. No date, recurrence or other dating context is supplied. Time: 13:15 UTC.",
    "ainglish": "A single future event ON-missing-date-utc-9 is mentioned. No date, recurrence or other dating context is supplied. Time: 13:15Z.",
    "question": "Does this message identify one unique dated instant? A = yes, exactly one instant. B = no unique dated instant. C = yes, always today. D = yes, always tomorrow.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "B",
    "settlement_stratum": "missing-date-utc",
    "strata": {
      "condition": "missing-date-utc",
      "frame_cluster": "clock-missing-date-utc-9",
      "date": "2026-07-15",
      "zone": "Europe/London",
      "clock": "13:15",
      "semantic_gold": "no unique dated instant",
      "answer_options": {
        "A": "yes, exactly one instant",
        "B": "no unique dated instant",
        "C": "yes, always today",
        "D": "yes, always tomorrow"
      }
    }
  },
  {
    "id": "clock-overnight-missing-date-utc-10",
    "english": "A single future event ON-missing-date-utc-10 is mentioned. No date, recurrence or other dating context is supplied. Time: 09:30 UTC.",
    "ainglish": "A single future event ON-missing-date-utc-10 is mentioned. No date, recurrence or other dating context is supplied. Time: 09:30Z.",
    "question": "Does this message identify one unique dated instant? A = yes, exactly one instant. B = yes, always today. C = no unique dated instant. D = yes, always tomorrow.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "C",
    "settlement_stratum": "missing-date-utc",
    "strata": {
      "condition": "missing-date-utc",
      "frame_cluster": "clock-missing-date-utc-10",
      "date": "2026-01-15",
      "zone": "America/New_York",
      "clock": "09:30",
      "semantic_gold": "no unique dated instant",
      "answer_options": {
        "A": "yes, exactly one instant",
        "B": "yes, always today",
        "C": "no unique dated instant",
        "D": "yes, always tomorrow"
      }
    }
  },
  {
    "id": "clock-overnight-missing-date-utc-11",
    "english": "A single future event ON-missing-date-utc-11 is mentioned. No date, recurrence or other dating context is supplied. Time: 10:45 UTC.",
    "ainglish": "A single future event ON-missing-date-utc-11 is mentioned. No date, recurrence or other dating context is supplied. Time: 10:45Z.",
    "question": "Does this message identify one unique dated instant? A = yes, exactly one instant. B = yes, always today. C = yes, always tomorrow. D = no unique dated instant.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "D",
    "settlement_stratum": "missing-date-utc",
    "strata": {
      "condition": "missing-date-utc",
      "frame_cluster": "clock-missing-date-utc-11",
      "date": "2026-07-15",
      "zone": "America/New_York",
      "clock": "10:45",
      "semantic_gold": "no unique dated instant",
      "answer_options": {
        "A": "yes, exactly one instant",
        "B": "yes, always today",
        "C": "yes, always tomorrow",
        "D": "no unique dated instant"
      }
    }
  },
  {
    "id": "clock-overnight-missing-date-utc-12",
    "english": "A single future event ON-missing-date-utc-12 is mentioned. No date, recurrence or other dating context is supplied. Time: 11:00 UTC.",
    "ainglish": "A single future event ON-missing-date-utc-12 is mentioned. No date, recurrence or other dating context is supplied. Time: 11:00Z.",
    "question": "Does this message identify one unique dated instant? A = no unique dated instant. B = yes, exactly one instant. C = yes, always today. D = yes, always tomorrow.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "A",
    "settlement_stratum": "missing-date-utc",
    "strata": {
      "condition": "missing-date-utc",
      "frame_cluster": "clock-missing-date-utc-12",
      "date": "2026-01-15",
      "zone": "Asia/Kolkata",
      "clock": "11:00",
      "semantic_gold": "no unique dated instant",
      "answer_options": {
        "A": "no unique dated instant",
        "B": "yes, exactly one instant",
        "C": "yes, always today",
        "D": "yes, always tomorrow"
      }
    }
  },
  {
    "id": "clock-overnight-missing-date-utc-13",
    "english": "A single future event ON-missing-date-utc-13 is mentioned. No date, recurrence or other dating context is supplied. Time: 12:15 UTC.",
    "ainglish": "A single future event ON-missing-date-utc-13 is mentioned. No date, recurrence or other dating context is supplied. Time: 12:15Z.",
    "question": "Does this message identify one unique dated instant? A = yes, exactly one instant. B = no unique dated instant. C = yes, always today. D = yes, always tomorrow.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "B",
    "settlement_stratum": "missing-date-utc",
    "strata": {
      "condition": "missing-date-utc",
      "frame_cluster": "clock-missing-date-utc-13",
      "date": "2026-07-15",
      "zone": "Asia/Kolkata",
      "clock": "12:15",
      "semantic_gold": "no unique dated instant",
      "answer_options": {
        "A": "yes, exactly one instant",
        "B": "no unique dated instant",
        "C": "yes, always today",
        "D": "yes, always tomorrow"
      }
    }
  },
  {
    "id": "clock-overnight-missing-date-utc-14",
    "english": "A single future event ON-missing-date-utc-14 is mentioned. No date, recurrence or other dating context is supplied. Time: 13:30 UTC.",
    "ainglish": "A single future event ON-missing-date-utc-14 is mentioned. No date, recurrence or other dating context is supplied. Time: 13:30Z.",
    "question": "Does this message identify one unique dated instant? A = yes, exactly one instant. B = yes, always today. C = no unique dated instant. D = yes, always tomorrow.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "C",
    "settlement_stratum": "missing-date-utc",
    "strata": {
      "condition": "missing-date-utc",
      "frame_cluster": "clock-missing-date-utc-14",
      "date": "2026-01-15",
      "zone": "Australia/Sydney",
      "clock": "13:30",
      "semantic_gold": "no unique dated instant",
      "answer_options": {
        "A": "yes, exactly one instant",
        "B": "yes, always today",
        "C": "no unique dated instant",
        "D": "yes, always tomorrow"
      }
    }
  },
  {
    "id": "clock-overnight-missing-date-utc-15",
    "english": "A single future event ON-missing-date-utc-15 is mentioned. No date, recurrence or other dating context is supplied. Time: 09:45 UTC.",
    "ainglish": "A single future event ON-missing-date-utc-15 is mentioned. No date, recurrence or other dating context is supplied. Time: 09:45Z.",
    "question": "Does this message identify one unique dated instant? A = yes, exactly one instant. B = yes, always today. C = yes, always tomorrow. D = no unique dated instant.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "D",
    "settlement_stratum": "missing-date-utc",
    "strata": {
      "condition": "missing-date-utc",
      "frame_cluster": "clock-missing-date-utc-15",
      "date": "2026-07-15",
      "zone": "Australia/Sydney",
      "clock": "09:45",
      "semantic_gold": "no unique dated instant",
      "answer_options": {
        "A": "yes, exactly one instant",
        "B": "yes, always today",
        "C": "yes, always tomorrow",
        "D": "no unique dated instant"
      }
    }
  },
  {
    "id": "clock-overnight-missing-date-civil-0",
    "english": "A single future event ON-missing-date-civil-0 is mentioned. No date, recurrence or other dating context is supplied. Time: 09:00 civil time in Europe/London.",
    "ainglish": "A single future event ON-missing-date-civil-0 is mentioned. No date, recurrence or other dating context is supplied. Time: 09:00@Europe/London.",
    "question": "Does this message identify one unique dated instant? A = no unique dated instant. B = yes, exactly one instant. C = yes, always today. D = yes, always tomorrow.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "A",
    "settlement_stratum": "missing-date-civil",
    "strata": {
      "condition": "missing-date-civil",
      "frame_cluster": "clock-missing-date-civil-0",
      "date": "2026-01-15",
      "zone": "Europe/London",
      "clock": "09:00",
      "semantic_gold": "no unique dated instant",
      "answer_options": {
        "A": "no unique dated instant",
        "B": "yes, exactly one instant",
        "C": "yes, always today",
        "D": "yes, always tomorrow"
      }
    }
  },
  {
    "id": "clock-overnight-missing-date-civil-1",
    "english": "A single future event ON-missing-date-civil-1 is mentioned. No date, recurrence or other dating context is supplied. Time: 10:15 civil time in Europe/London.",
    "ainglish": "A single future event ON-missing-date-civil-1 is mentioned. No date, recurrence or other dating context is supplied. Time: 10:15@Europe/London.",
    "question": "Does this message identify one unique dated instant? A = yes, exactly one instant. B = no unique dated instant. C = yes, always today. D = yes, always tomorrow.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "B",
    "settlement_stratum": "missing-date-civil",
    "strata": {
      "condition": "missing-date-civil",
      "frame_cluster": "clock-missing-date-civil-1",
      "date": "2026-07-15",
      "zone": "Europe/London",
      "clock": "10:15",
      "semantic_gold": "no unique dated instant",
      "answer_options": {
        "A": "yes, exactly one instant",
        "B": "no unique dated instant",
        "C": "yes, always today",
        "D": "yes, always tomorrow"
      }
    }
  },
  {
    "id": "clock-overnight-missing-date-civil-2",
    "english": "A single future event ON-missing-date-civil-2 is mentioned. No date, recurrence or other dating context is supplied. Time: 11:30 civil time in America/New_York.",
    "ainglish": "A single future event ON-missing-date-civil-2 is mentioned. No date, recurrence or other dating context is supplied. Time: 11:30@America/New_York.",
    "question": "Does this message identify one unique dated instant? A = yes, exactly one instant. B = yes, always today. C = no unique dated instant. D = yes, always tomorrow.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "C",
    "settlement_stratum": "missing-date-civil",
    "strata": {
      "condition": "missing-date-civil",
      "frame_cluster": "clock-missing-date-civil-2",
      "date": "2026-01-15",
      "zone": "America/New_York",
      "clock": "11:30",
      "semantic_gold": "no unique dated instant",
      "answer_options": {
        "A": "yes, exactly one instant",
        "B": "yes, always today",
        "C": "no unique dated instant",
        "D": "yes, always tomorrow"
      }
    }
  },
  {
    "id": "clock-overnight-missing-date-civil-3",
    "english": "A single future event ON-missing-date-civil-3 is mentioned. No date, recurrence or other dating context is supplied. Time: 12:45 civil time in America/New_York.",
    "ainglish": "A single future event ON-missing-date-civil-3 is mentioned. No date, recurrence or other dating context is supplied. Time: 12:45@America/New_York.",
    "question": "Does this message identify one unique dated instant? A = yes, exactly one instant. B = yes, always today. C = yes, always tomorrow. D = no unique dated instant.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "D",
    "settlement_stratum": "missing-date-civil",
    "strata": {
      "condition": "missing-date-civil",
      "frame_cluster": "clock-missing-date-civil-3",
      "date": "2026-07-15",
      "zone": "America/New_York",
      "clock": "12:45",
      "semantic_gold": "no unique dated instant",
      "answer_options": {
        "A": "yes, exactly one instant",
        "B": "yes, always today",
        "C": "yes, always tomorrow",
        "D": "no unique dated instant"
      }
    }
  },
  {
    "id": "clock-overnight-missing-date-civil-4",
    "english": "A single future event ON-missing-date-civil-4 is mentioned. No date, recurrence or other dating context is supplied. Time: 13:00 civil time in Asia/Kolkata.",
    "ainglish": "A single future event ON-missing-date-civil-4 is mentioned. No date, recurrence or other dating context is supplied. Time: 13:00@Asia/Kolkata.",
    "question": "Does this message identify one unique dated instant? A = no unique dated instant. B = yes, exactly one instant. C = yes, always today. D = yes, always tomorrow.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "A",
    "settlement_stratum": "missing-date-civil",
    "strata": {
      "condition": "missing-date-civil",
      "frame_cluster": "clock-missing-date-civil-4",
      "date": "2026-01-15",
      "zone": "Asia/Kolkata",
      "clock": "13:00",
      "semantic_gold": "no unique dated instant",
      "answer_options": {
        "A": "no unique dated instant",
        "B": "yes, exactly one instant",
        "C": "yes, always today",
        "D": "yes, always tomorrow"
      }
    }
  },
  {
    "id": "clock-overnight-missing-date-civil-5",
    "english": "A single future event ON-missing-date-civil-5 is mentioned. No date, recurrence or other dating context is supplied. Time: 09:15 civil time in Asia/Kolkata.",
    "ainglish": "A single future event ON-missing-date-civil-5 is mentioned. No date, recurrence or other dating context is supplied. Time: 09:15@Asia/Kolkata.",
    "question": "Does this message identify one unique dated instant? A = yes, exactly one instant. B = no unique dated instant. C = yes, always today. D = yes, always tomorrow.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "B",
    "settlement_stratum": "missing-date-civil",
    "strata": {
      "condition": "missing-date-civil",
      "frame_cluster": "clock-missing-date-civil-5",
      "date": "2026-07-15",
      "zone": "Asia/Kolkata",
      "clock": "09:15",
      "semantic_gold": "no unique dated instant",
      "answer_options": {
        "A": "yes, exactly one instant",
        "B": "no unique dated instant",
        "C": "yes, always today",
        "D": "yes, always tomorrow"
      }
    }
  },
  {
    "id": "clock-overnight-missing-date-civil-6",
    "english": "A single future event ON-missing-date-civil-6 is mentioned. No date, recurrence or other dating context is supplied. Time: 10:30 civil time in Australia/Sydney.",
    "ainglish": "A single future event ON-missing-date-civil-6 is mentioned. No date, recurrence or other dating context is supplied. Time: 10:30@Australia/Sydney.",
    "question": "Does this message identify one unique dated instant? A = yes, exactly one instant. B = yes, always today. C = no unique dated instant. D = yes, always tomorrow.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "C",
    "settlement_stratum": "missing-date-civil",
    "strata": {
      "condition": "missing-date-civil",
      "frame_cluster": "clock-missing-date-civil-6",
      "date": "2026-01-15",
      "zone": "Australia/Sydney",
      "clock": "10:30",
      "semantic_gold": "no unique dated instant",
      "answer_options": {
        "A": "yes, exactly one instant",
        "B": "yes, always today",
        "C": "no unique dated instant",
        "D": "yes, always tomorrow"
      }
    }
  },
  {
    "id": "clock-overnight-missing-date-civil-7",
    "english": "A single future event ON-missing-date-civil-7 is mentioned. No date, recurrence or other dating context is supplied. Time: 11:45 civil time in Australia/Sydney.",
    "ainglish": "A single future event ON-missing-date-civil-7 is mentioned. No date, recurrence or other dating context is supplied. Time: 11:45@Australia/Sydney.",
    "question": "Does this message identify one unique dated instant? A = yes, exactly one instant. B = yes, always today. C = yes, always tomorrow. D = no unique dated instant.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "D",
    "settlement_stratum": "missing-date-civil",
    "strata": {
      "condition": "missing-date-civil",
      "frame_cluster": "clock-missing-date-civil-7",
      "date": "2026-07-15",
      "zone": "Australia/Sydney",
      "clock": "11:45",
      "semantic_gold": "no unique dated instant",
      "answer_options": {
        "A": "yes, exactly one instant",
        "B": "yes, always today",
        "C": "yes, always tomorrow",
        "D": "no unique dated instant"
      }
    }
  },
  {
    "id": "clock-overnight-missing-date-civil-8",
    "english": "A single future event ON-missing-date-civil-8 is mentioned. No date, recurrence or other dating context is supplied. Time: 12:00 civil time in Europe/London.",
    "ainglish": "A single future event ON-missing-date-civil-8 is mentioned. No date, recurrence or other dating context is supplied. Time: 12:00@Europe/London.",
    "question": "Does this message identify one unique dated instant? A = no unique dated instant. B = yes, exactly one instant. C = yes, always today. D = yes, always tomorrow.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "A",
    "settlement_stratum": "missing-date-civil",
    "strata": {
      "condition": "missing-date-civil",
      "frame_cluster": "clock-missing-date-civil-8",
      "date": "2026-01-15",
      "zone": "Europe/London",
      "clock": "12:00",
      "semantic_gold": "no unique dated instant",
      "answer_options": {
        "A": "no unique dated instant",
        "B": "yes, exactly one instant",
        "C": "yes, always today",
        "D": "yes, always tomorrow"
      }
    }
  },
  {
    "id": "clock-overnight-missing-date-civil-9",
    "english": "A single future event ON-missing-date-civil-9 is mentioned. No date, recurrence or other dating context is supplied. Time: 13:15 civil time in Europe/London.",
    "ainglish": "A single future event ON-missing-date-civil-9 is mentioned. No date, recurrence or other dating context is supplied. Time: 13:15@Europe/London.",
    "question": "Does this message identify one unique dated instant? A = yes, exactly one instant. B = no unique dated instant. C = yes, always today. D = yes, always tomorrow.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "B",
    "settlement_stratum": "missing-date-civil",
    "strata": {
      "condition": "missing-date-civil",
      "frame_cluster": "clock-missing-date-civil-9",
      "date": "2026-07-15",
      "zone": "Europe/London",
      "clock": "13:15",
      "semantic_gold": "no unique dated instant",
      "answer_options": {
        "A": "yes, exactly one instant",
        "B": "no unique dated instant",
        "C": "yes, always today",
        "D": "yes, always tomorrow"
      }
    }
  },
  {
    "id": "clock-overnight-missing-date-civil-10",
    "english": "A single future event ON-missing-date-civil-10 is mentioned. No date, recurrence or other dating context is supplied. Time: 09:30 civil time in America/New_York.",
    "ainglish": "A single future event ON-missing-date-civil-10 is mentioned. No date, recurrence or other dating context is supplied. Time: 09:30@America/New_York.",
    "question": "Does this message identify one unique dated instant? A = yes, exactly one instant. B = yes, always today. C = no unique dated instant. D = yes, always tomorrow.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "C",
    "settlement_stratum": "missing-date-civil",
    "strata": {
      "condition": "missing-date-civil",
      "frame_cluster": "clock-missing-date-civil-10",
      "date": "2026-01-15",
      "zone": "America/New_York",
      "clock": "09:30",
      "semantic_gold": "no unique dated instant",
      "answer_options": {
        "A": "yes, exactly one instant",
        "B": "yes, always today",
        "C": "no unique dated instant",
        "D": "yes, always tomorrow"
      }
    }
  },
  {
    "id": "clock-overnight-missing-date-civil-11",
    "english": "A single future event ON-missing-date-civil-11 is mentioned. No date, recurrence or other dating context is supplied. Time: 10:45 civil time in America/New_York.",
    "ainglish": "A single future event ON-missing-date-civil-11 is mentioned. No date, recurrence or other dating context is supplied. Time: 10:45@America/New_York.",
    "question": "Does this message identify one unique dated instant? A = yes, exactly one instant. B = yes, always today. C = yes, always tomorrow. D = no unique dated instant.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "D",
    "settlement_stratum": "missing-date-civil",
    "strata": {
      "condition": "missing-date-civil",
      "frame_cluster": "clock-missing-date-civil-11",
      "date": "2026-07-15",
      "zone": "America/New_York",
      "clock": "10:45",
      "semantic_gold": "no unique dated instant",
      "answer_options": {
        "A": "yes, exactly one instant",
        "B": "yes, always today",
        "C": "yes, always tomorrow",
        "D": "no unique dated instant"
      }
    }
  },
  {
    "id": "clock-overnight-missing-date-civil-12",
    "english": "A single future event ON-missing-date-civil-12 is mentioned. No date, recurrence or other dating context is supplied. Time: 11:00 civil time in Asia/Kolkata.",
    "ainglish": "A single future event ON-missing-date-civil-12 is mentioned. No date, recurrence or other dating context is supplied. Time: 11:00@Asia/Kolkata.",
    "question": "Does this message identify one unique dated instant? A = no unique dated instant. B = yes, exactly one instant. C = yes, always today. D = yes, always tomorrow.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "A",
    "settlement_stratum": "missing-date-civil",
    "strata": {
      "condition": "missing-date-civil",
      "frame_cluster": "clock-missing-date-civil-12",
      "date": "2026-01-15",
      "zone": "Asia/Kolkata",
      "clock": "11:00",
      "semantic_gold": "no unique dated instant",
      "answer_options": {
        "A": "no unique dated instant",
        "B": "yes, exactly one instant",
        "C": "yes, always today",
        "D": "yes, always tomorrow"
      }
    }
  },
  {
    "id": "clock-overnight-missing-date-civil-13",
    "english": "A single future event ON-missing-date-civil-13 is mentioned. No date, recurrence or other dating context is supplied. Time: 12:15 civil time in Asia/Kolkata.",
    "ainglish": "A single future event ON-missing-date-civil-13 is mentioned. No date, recurrence or other dating context is supplied. Time: 12:15@Asia/Kolkata.",
    "question": "Does this message identify one unique dated instant? A = yes, exactly one instant. B = no unique dated instant. C = yes, always today. D = yes, always tomorrow.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "B",
    "settlement_stratum": "missing-date-civil",
    "strata": {
      "condition": "missing-date-civil",
      "frame_cluster": "clock-missing-date-civil-13",
      "date": "2026-07-15",
      "zone": "Asia/Kolkata",
      "clock": "12:15",
      "semantic_gold": "no unique dated instant",
      "answer_options": {
        "A": "yes, exactly one instant",
        "B": "no unique dated instant",
        "C": "yes, always today",
        "D": "yes, always tomorrow"
      }
    }
  },
  {
    "id": "clock-overnight-missing-date-civil-14",
    "english": "A single future event ON-missing-date-civil-14 is mentioned. No date, recurrence or other dating context is supplied. Time: 13:30 civil time in Australia/Sydney.",
    "ainglish": "A single future event ON-missing-date-civil-14 is mentioned. No date, recurrence or other dating context is supplied. Time: 13:30@Australia/Sydney.",
    "question": "Does this message identify one unique dated instant? A = yes, exactly one instant. B = yes, always today. C = no unique dated instant. D = yes, always tomorrow.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "C",
    "settlement_stratum": "missing-date-civil",
    "strata": {
      "condition": "missing-date-civil",
      "frame_cluster": "clock-missing-date-civil-14",
      "date": "2026-01-15",
      "zone": "Australia/Sydney",
      "clock": "13:30",
      "semantic_gold": "no unique dated instant",
      "answer_options": {
        "A": "yes, exactly one instant",
        "B": "yes, always today",
        "C": "no unique dated instant",
        "D": "yes, always tomorrow"
      }
    }
  },
  {
    "id": "clock-overnight-missing-date-civil-15",
    "english": "A single future event ON-missing-date-civil-15 is mentioned. No date, recurrence or other dating context is supplied. Time: 09:45 civil time in Australia/Sydney.",
    "ainglish": "A single future event ON-missing-date-civil-15 is mentioned. No date, recurrence or other dating context is supplied. Time: 09:45@Australia/Sydney.",
    "question": "Does this message identify one unique dated instant? A = yes, exactly one instant. B = yes, always today. C = yes, always tomorrow. D = no unique dated instant.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "D",
    "settlement_stratum": "missing-date-civil",
    "strata": {
      "condition": "missing-date-civil",
      "frame_cluster": "clock-missing-date-civil-15",
      "date": "2026-07-15",
      "zone": "Australia/Sydney",
      "clock": "09:45",
      "semantic_gold": "no unique dated instant",
      "answer_options": {
        "A": "yes, exactly one instant",
        "B": "yes, always today",
        "C": "yes, always tomorrow",
        "D": "no unique dated instant"
      }
    }
  },
  {
    "id": "clock-overnight-fold-0",
    "english": "The date of event ON-fold-0 is 2026-10-25. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:00 civil time in Europe/London.",
    "ainglish": "The date of event ON-fold-0 is 2026-10-25. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:00@Europe/London.",
    "question": "How many actual UTC instants match that civil reading on the supplied date? A = two matching instants. B = no matching instant. C = one matching instant. D = the message guarantees a duration.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "A",
    "settlement_stratum": "fold",
    "strata": {
      "condition": "fold",
      "frame_cluster": "clock-fold-0",
      "date": "2026-10-25",
      "zone": "Europe/London",
      "clock": "01:00",
      "matching_instants": [
        "2026-10-25T00:00:00+00:00",
        "2026-10-25T01:00:00+00:00"
      ],
      "semantic_gold": "two matching instants",
      "answer_options": {
        "A": "two matching instants",
        "B": "no matching instant",
        "C": "one matching instant",
        "D": "the message guarantees a duration"
      }
    }
  },
  {
    "id": "clock-overnight-fold-1",
    "english": "The date of event ON-fold-1 is 2026-10-25. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:15 civil time in Europe/London.",
    "ainglish": "The date of event ON-fold-1 is 2026-10-25. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:15@Europe/London.",
    "question": "How many actual UTC instants match that civil reading on the supplied date? A = no matching instant. B = two matching instants. C = one matching instant. D = the message guarantees a duration.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "B",
    "settlement_stratum": "fold",
    "strata": {
      "condition": "fold",
      "frame_cluster": "clock-fold-1",
      "date": "2026-10-25",
      "zone": "Europe/London",
      "clock": "01:15",
      "matching_instants": [
        "2026-10-25T00:15:00+00:00",
        "2026-10-25T01:15:00+00:00"
      ],
      "semantic_gold": "two matching instants",
      "answer_options": {
        "A": "no matching instant",
        "B": "two matching instants",
        "C": "one matching instant",
        "D": "the message guarantees a duration"
      }
    }
  },
  {
    "id": "clock-overnight-fold-2",
    "english": "The date of event ON-fold-2 is 2026-10-25. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:30 civil time in Europe/London.",
    "ainglish": "The date of event ON-fold-2 is 2026-10-25. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:30@Europe/London.",
    "question": "How many actual UTC instants match that civil reading on the supplied date? A = no matching instant. B = one matching instant. C = two matching instants. D = the message guarantees a duration.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "C",
    "settlement_stratum": "fold",
    "strata": {
      "condition": "fold",
      "frame_cluster": "clock-fold-2",
      "date": "2026-10-25",
      "zone": "Europe/London",
      "clock": "01:30",
      "matching_instants": [
        "2026-10-25T00:30:00+00:00",
        "2026-10-25T01:30:00+00:00"
      ],
      "semantic_gold": "two matching instants",
      "answer_options": {
        "A": "no matching instant",
        "B": "one matching instant",
        "C": "two matching instants",
        "D": "the message guarantees a duration"
      }
    }
  },
  {
    "id": "clock-overnight-fold-3",
    "english": "The date of event ON-fold-3 is 2026-10-25. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:45 civil time in Europe/London.",
    "ainglish": "The date of event ON-fold-3 is 2026-10-25. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:45@Europe/London.",
    "question": "How many actual UTC instants match that civil reading on the supplied date? A = no matching instant. B = one matching instant. C = the message guarantees a duration. D = two matching instants.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "D",
    "settlement_stratum": "fold",
    "strata": {
      "condition": "fold",
      "frame_cluster": "clock-fold-3",
      "date": "2026-10-25",
      "zone": "Europe/London",
      "clock": "01:45",
      "matching_instants": [
        "2026-10-25T00:45:00+00:00",
        "2026-10-25T01:45:00+00:00"
      ],
      "semantic_gold": "two matching instants",
      "answer_options": {
        "A": "no matching instant",
        "B": "one matching instant",
        "C": "the message guarantees a duration",
        "D": "two matching instants"
      }
    }
  },
  {
    "id": "clock-overnight-fold-4",
    "english": "The date of event ON-fold-4 is 2026-10-25. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:00 civil time in Europe/London.",
    "ainglish": "The date of event ON-fold-4 is 2026-10-25. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:00@Europe/London.",
    "question": "How many actual UTC instants match that civil reading on the supplied date? A = two matching instants. B = no matching instant. C = one matching instant. D = the message guarantees a duration.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "A",
    "settlement_stratum": "fold",
    "strata": {
      "condition": "fold",
      "frame_cluster": "clock-fold-4",
      "date": "2026-10-25",
      "zone": "Europe/London",
      "clock": "01:00",
      "matching_instants": [
        "2026-10-25T00:00:00+00:00",
        "2026-10-25T01:00:00+00:00"
      ],
      "semantic_gold": "two matching instants",
      "answer_options": {
        "A": "two matching instants",
        "B": "no matching instant",
        "C": "one matching instant",
        "D": "the message guarantees a duration"
      }
    }
  },
  {
    "id": "clock-overnight-fold-5",
    "english": "The date of event ON-fold-5 is 2026-10-25. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:15 civil time in Europe/London.",
    "ainglish": "The date of event ON-fold-5 is 2026-10-25. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:15@Europe/London.",
    "question": "How many actual UTC instants match that civil reading on the supplied date? A = no matching instant. B = two matching instants. C = one matching instant. D = the message guarantees a duration.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "B",
    "settlement_stratum": "fold",
    "strata": {
      "condition": "fold",
      "frame_cluster": "clock-fold-5",
      "date": "2026-10-25",
      "zone": "Europe/London",
      "clock": "01:15",
      "matching_instants": [
        "2026-10-25T00:15:00+00:00",
        "2026-10-25T01:15:00+00:00"
      ],
      "semantic_gold": "two matching instants",
      "answer_options": {
        "A": "no matching instant",
        "B": "two matching instants",
        "C": "one matching instant",
        "D": "the message guarantees a duration"
      }
    }
  },
  {
    "id": "clock-overnight-fold-6",
    "english": "The date of event ON-fold-6 is 2026-10-25. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:30 civil time in Europe/London.",
    "ainglish": "The date of event ON-fold-6 is 2026-10-25. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:30@Europe/London.",
    "question": "How many actual UTC instants match that civil reading on the supplied date? A = no matching instant. B = one matching instant. C = two matching instants. D = the message guarantees a duration.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "C",
    "settlement_stratum": "fold",
    "strata": {
      "condition": "fold",
      "frame_cluster": "clock-fold-6",
      "date": "2026-10-25",
      "zone": "Europe/London",
      "clock": "01:30",
      "matching_instants": [
        "2026-10-25T00:30:00+00:00",
        "2026-10-25T01:30:00+00:00"
      ],
      "semantic_gold": "two matching instants",
      "answer_options": {
        "A": "no matching instant",
        "B": "one matching instant",
        "C": "two matching instants",
        "D": "the message guarantees a duration"
      }
    }
  },
  {
    "id": "clock-overnight-fold-7",
    "english": "The date of event ON-fold-7 is 2026-10-25. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:45 civil time in Europe/London.",
    "ainglish": "The date of event ON-fold-7 is 2026-10-25. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:45@Europe/London.",
    "question": "How many actual UTC instants match that civil reading on the supplied date? A = no matching instant. B = one matching instant. C = the message guarantees a duration. D = two matching instants.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "D",
    "settlement_stratum": "fold",
    "strata": {
      "condition": "fold",
      "frame_cluster": "clock-fold-7",
      "date": "2026-10-25",
      "zone": "Europe/London",
      "clock": "01:45",
      "matching_instants": [
        "2026-10-25T00:45:00+00:00",
        "2026-10-25T01:45:00+00:00"
      ],
      "semantic_gold": "two matching instants",
      "answer_options": {
        "A": "no matching instant",
        "B": "one matching instant",
        "C": "the message guarantees a duration",
        "D": "two matching instants"
      }
    }
  },
  {
    "id": "clock-overnight-fold-8",
    "english": "The date of event ON-fold-8 is 2026-10-25. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:00 civil time in Europe/London.",
    "ainglish": "The date of event ON-fold-8 is 2026-10-25. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:00@Europe/London.",
    "question": "How many actual UTC instants match that civil reading on the supplied date? A = two matching instants. B = no matching instant. C = one matching instant. D = the message guarantees a duration.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "A",
    "settlement_stratum": "fold",
    "strata": {
      "condition": "fold",
      "frame_cluster": "clock-fold-8",
      "date": "2026-10-25",
      "zone": "Europe/London",
      "clock": "01:00",
      "matching_instants": [
        "2026-10-25T00:00:00+00:00",
        "2026-10-25T01:00:00+00:00"
      ],
      "semantic_gold": "two matching instants",
      "answer_options": {
        "A": "two matching instants",
        "B": "no matching instant",
        "C": "one matching instant",
        "D": "the message guarantees a duration"
      }
    }
  },
  {
    "id": "clock-overnight-fold-9",
    "english": "The date of event ON-fold-9 is 2026-10-25. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:15 civil time in Europe/London.",
    "ainglish": "The date of event ON-fold-9 is 2026-10-25. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:15@Europe/London.",
    "question": "How many actual UTC instants match that civil reading on the supplied date? A = no matching instant. B = two matching instants. C = one matching instant. D = the message guarantees a duration.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "B",
    "settlement_stratum": "fold",
    "strata": {
      "condition": "fold",
      "frame_cluster": "clock-fold-9",
      "date": "2026-10-25",
      "zone": "Europe/London",
      "clock": "01:15",
      "matching_instants": [
        "2026-10-25T00:15:00+00:00",
        "2026-10-25T01:15:00+00:00"
      ],
      "semantic_gold": "two matching instants",
      "answer_options": {
        "A": "no matching instant",
        "B": "two matching instants",
        "C": "one matching instant",
        "D": "the message guarantees a duration"
      }
    }
  },
  {
    "id": "clock-overnight-fold-10",
    "english": "The date of event ON-fold-10 is 2026-10-25. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:30 civil time in Europe/London.",
    "ainglish": "The date of event ON-fold-10 is 2026-10-25. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:30@Europe/London.",
    "question": "How many actual UTC instants match that civil reading on the supplied date? A = no matching instant. B = one matching instant. C = two matching instants. D = the message guarantees a duration.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "C",
    "settlement_stratum": "fold",
    "strata": {
      "condition": "fold",
      "frame_cluster": "clock-fold-10",
      "date": "2026-10-25",
      "zone": "Europe/London",
      "clock": "01:30",
      "matching_instants": [
        "2026-10-25T00:30:00+00:00",
        "2026-10-25T01:30:00+00:00"
      ],
      "semantic_gold": "two matching instants",
      "answer_options": {
        "A": "no matching instant",
        "B": "one matching instant",
        "C": "two matching instants",
        "D": "the message guarantees a duration"
      }
    }
  },
  {
    "id": "clock-overnight-fold-11",
    "english": "The date of event ON-fold-11 is 2026-10-25. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:45 civil time in Europe/London.",
    "ainglish": "The date of event ON-fold-11 is 2026-10-25. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:45@Europe/London.",
    "question": "How many actual UTC instants match that civil reading on the supplied date? A = no matching instant. B = one matching instant. C = the message guarantees a duration. D = two matching instants.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "D",
    "settlement_stratum": "fold",
    "strata": {
      "condition": "fold",
      "frame_cluster": "clock-fold-11",
      "date": "2026-10-25",
      "zone": "Europe/London",
      "clock": "01:45",
      "matching_instants": [
        "2026-10-25T00:45:00+00:00",
        "2026-10-25T01:45:00+00:00"
      ],
      "semantic_gold": "two matching instants",
      "answer_options": {
        "A": "no matching instant",
        "B": "one matching instant",
        "C": "the message guarantees a duration",
        "D": "two matching instants"
      }
    }
  },
  {
    "id": "clock-overnight-fold-12",
    "english": "The date of event ON-fold-12 is 2026-10-25. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:00 civil time in Europe/London.",
    "ainglish": "The date of event ON-fold-12 is 2026-10-25. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:00@Europe/London.",
    "question": "How many actual UTC instants match that civil reading on the supplied date? A = two matching instants. B = no matching instant. C = one matching instant. D = the message guarantees a duration.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "A",
    "settlement_stratum": "fold",
    "strata": {
      "condition": "fold",
      "frame_cluster": "clock-fold-12",
      "date": "2026-10-25",
      "zone": "Europe/London",
      "clock": "01:00",
      "matching_instants": [
        "2026-10-25T00:00:00+00:00",
        "2026-10-25T01:00:00+00:00"
      ],
      "semantic_gold": "two matching instants",
      "answer_options": {
        "A": "two matching instants",
        "B": "no matching instant",
        "C": "one matching instant",
        "D": "the message guarantees a duration"
      }
    }
  },
  {
    "id": "clock-overnight-fold-13",
    "english": "The date of event ON-fold-13 is 2026-10-25. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:15 civil time in Europe/London.",
    "ainglish": "The date of event ON-fold-13 is 2026-10-25. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:15@Europe/London.",
    "question": "How many actual UTC instants match that civil reading on the supplied date? A = no matching instant. B = two matching instants. C = one matching instant. D = the message guarantees a duration.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "B",
    "settlement_stratum": "fold",
    "strata": {
      "condition": "fold",
      "frame_cluster": "clock-fold-13",
      "date": "2026-10-25",
      "zone": "Europe/London",
      "clock": "01:15",
      "matching_instants": [
        "2026-10-25T00:15:00+00:00",
        "2026-10-25T01:15:00+00:00"
      ],
      "semantic_gold": "two matching instants",
      "answer_options": {
        "A": "no matching instant",
        "B": "two matching instants",
        "C": "one matching instant",
        "D": "the message guarantees a duration"
      }
    }
  },
  {
    "id": "clock-overnight-fold-14",
    "english": "The date of event ON-fold-14 is 2026-10-25. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:30 civil time in Europe/London.",
    "ainglish": "The date of event ON-fold-14 is 2026-10-25. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:30@Europe/London.",
    "question": "How many actual UTC instants match that civil reading on the supplied date? A = no matching instant. B = one matching instant. C = two matching instants. D = the message guarantees a duration.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "C",
    "settlement_stratum": "fold",
    "strata": {
      "condition": "fold",
      "frame_cluster": "clock-fold-14",
      "date": "2026-10-25",
      "zone": "Europe/London",
      "clock": "01:30",
      "matching_instants": [
        "2026-10-25T00:30:00+00:00",
        "2026-10-25T01:30:00+00:00"
      ],
      "semantic_gold": "two matching instants",
      "answer_options": {
        "A": "no matching instant",
        "B": "one matching instant",
        "C": "two matching instants",
        "D": "the message guarantees a duration"
      }
    }
  },
  {
    "id": "clock-overnight-fold-15",
    "english": "The date of event ON-fold-15 is 2026-10-25. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:45 civil time in Europe/London.",
    "ainglish": "The date of event ON-fold-15 is 2026-10-25. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:45@Europe/London.",
    "question": "How many actual UTC instants match that civil reading on the supplied date? A = no matching instant. B = one matching instant. C = the message guarantees a duration. D = two matching instants.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "D",
    "settlement_stratum": "fold",
    "strata": {
      "condition": "fold",
      "frame_cluster": "clock-fold-15",
      "date": "2026-10-25",
      "zone": "Europe/London",
      "clock": "01:45",
      "matching_instants": [
        "2026-10-25T00:45:00+00:00",
        "2026-10-25T01:45:00+00:00"
      ],
      "semantic_gold": "two matching instants",
      "answer_options": {
        "A": "no matching instant",
        "B": "one matching instant",
        "C": "the message guarantees a duration",
        "D": "two matching instants"
      }
    }
  },
  {
    "id": "clock-overnight-gap-0",
    "english": "The date of event ON-gap-0 is 2026-03-29. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:00 civil time in Europe/London.",
    "ainglish": "The date of event ON-gap-0 is 2026-03-29. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:00@Europe/London.",
    "question": "How many actual UTC instants match that civil reading on the supplied date? A = no matching instant. B = one matching instant. C = two matching instants. D = the message guarantees a duration.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "A",
    "settlement_stratum": "gap",
    "strata": {
      "condition": "gap",
      "frame_cluster": "clock-gap-0",
      "date": "2026-03-29",
      "zone": "Europe/London",
      "clock": "01:00",
      "matching_instants": [],
      "semantic_gold": "no matching instant",
      "answer_options": {
        "A": "no matching instant",
        "B": "one matching instant",
        "C": "two matching instants",
        "D": "the message guarantees a duration"
      }
    }
  },
  {
    "id": "clock-overnight-gap-1",
    "english": "The date of event ON-gap-1 is 2026-03-29. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:15 civil time in Europe/London.",
    "ainglish": "The date of event ON-gap-1 is 2026-03-29. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:15@Europe/London.",
    "question": "How many actual UTC instants match that civil reading on the supplied date? A = one matching instant. B = no matching instant. C = two matching instants. D = the message guarantees a duration.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "B",
    "settlement_stratum": "gap",
    "strata": {
      "condition": "gap",
      "frame_cluster": "clock-gap-1",
      "date": "2026-03-29",
      "zone": "Europe/London",
      "clock": "01:15",
      "matching_instants": [],
      "semantic_gold": "no matching instant",
      "answer_options": {
        "A": "one matching instant",
        "B": "no matching instant",
        "C": "two matching instants",
        "D": "the message guarantees a duration"
      }
    }
  },
  {
    "id": "clock-overnight-gap-2",
    "english": "The date of event ON-gap-2 is 2026-03-29. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:30 civil time in Europe/London.",
    "ainglish": "The date of event ON-gap-2 is 2026-03-29. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:30@Europe/London.",
    "question": "How many actual UTC instants match that civil reading on the supplied date? A = one matching instant. B = two matching instants. C = no matching instant. D = the message guarantees a duration.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "C",
    "settlement_stratum": "gap",
    "strata": {
      "condition": "gap",
      "frame_cluster": "clock-gap-2",
      "date": "2026-03-29",
      "zone": "Europe/London",
      "clock": "01:30",
      "matching_instants": [],
      "semantic_gold": "no matching instant",
      "answer_options": {
        "A": "one matching instant",
        "B": "two matching instants",
        "C": "no matching instant",
        "D": "the message guarantees a duration"
      }
    }
  },
  {
    "id": "clock-overnight-gap-3",
    "english": "The date of event ON-gap-3 is 2026-03-29. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:45 civil time in Europe/London.",
    "ainglish": "The date of event ON-gap-3 is 2026-03-29. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:45@Europe/London.",
    "question": "How many actual UTC instants match that civil reading on the supplied date? A = one matching instant. B = two matching instants. C = the message guarantees a duration. D = no matching instant.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "D",
    "settlement_stratum": "gap",
    "strata": {
      "condition": "gap",
      "frame_cluster": "clock-gap-3",
      "date": "2026-03-29",
      "zone": "Europe/London",
      "clock": "01:45",
      "matching_instants": [],
      "semantic_gold": "no matching instant",
      "answer_options": {
        "A": "one matching instant",
        "B": "two matching instants",
        "C": "the message guarantees a duration",
        "D": "no matching instant"
      }
    }
  },
  {
    "id": "clock-overnight-gap-4",
    "english": "The date of event ON-gap-4 is 2026-03-29. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:00 civil time in Europe/London.",
    "ainglish": "The date of event ON-gap-4 is 2026-03-29. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:00@Europe/London.",
    "question": "How many actual UTC instants match that civil reading on the supplied date? A = no matching instant. B = one matching instant. C = two matching instants. D = the message guarantees a duration.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "A",
    "settlement_stratum": "gap",
    "strata": {
      "condition": "gap",
      "frame_cluster": "clock-gap-4",
      "date": "2026-03-29",
      "zone": "Europe/London",
      "clock": "01:00",
      "matching_instants": [],
      "semantic_gold": "no matching instant",
      "answer_options": {
        "A": "no matching instant",
        "B": "one matching instant",
        "C": "two matching instants",
        "D": "the message guarantees a duration"
      }
    }
  },
  {
    "id": "clock-overnight-gap-5",
    "english": "The date of event ON-gap-5 is 2026-03-29. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:15 civil time in Europe/London.",
    "ainglish": "The date of event ON-gap-5 is 2026-03-29. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:15@Europe/London.",
    "question": "How many actual UTC instants match that civil reading on the supplied date? A = one matching instant. B = no matching instant. C = two matching instants. D = the message guarantees a duration.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "B",
    "settlement_stratum": "gap",
    "strata": {
      "condition": "gap",
      "frame_cluster": "clock-gap-5",
      "date": "2026-03-29",
      "zone": "Europe/London",
      "clock": "01:15",
      "matching_instants": [],
      "semantic_gold": "no matching instant",
      "answer_options": {
        "A": "one matching instant",
        "B": "no matching instant",
        "C": "two matching instants",
        "D": "the message guarantees a duration"
      }
    }
  },
  {
    "id": "clock-overnight-gap-6",
    "english": "The date of event ON-gap-6 is 2026-03-29. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:30 civil time in Europe/London.",
    "ainglish": "The date of event ON-gap-6 is 2026-03-29. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:30@Europe/London.",
    "question": "How many actual UTC instants match that civil reading on the supplied date? A = one matching instant. B = two matching instants. C = no matching instant. D = the message guarantees a duration.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "C",
    "settlement_stratum": "gap",
    "strata": {
      "condition": "gap",
      "frame_cluster": "clock-gap-6",
      "date": "2026-03-29",
      "zone": "Europe/London",
      "clock": "01:30",
      "matching_instants": [],
      "semantic_gold": "no matching instant",
      "answer_options": {
        "A": "one matching instant",
        "B": "two matching instants",
        "C": "no matching instant",
        "D": "the message guarantees a duration"
      }
    }
  },
  {
    "id": "clock-overnight-gap-7",
    "english": "The date of event ON-gap-7 is 2026-03-29. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:45 civil time in Europe/London.",
    "ainglish": "The date of event ON-gap-7 is 2026-03-29. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:45@Europe/London.",
    "question": "How many actual UTC instants match that civil reading on the supplied date? A = one matching instant. B = two matching instants. C = the message guarantees a duration. D = no matching instant.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "D",
    "settlement_stratum": "gap",
    "strata": {
      "condition": "gap",
      "frame_cluster": "clock-gap-7",
      "date": "2026-03-29",
      "zone": "Europe/London",
      "clock": "01:45",
      "matching_instants": [],
      "semantic_gold": "no matching instant",
      "answer_options": {
        "A": "one matching instant",
        "B": "two matching instants",
        "C": "the message guarantees a duration",
        "D": "no matching instant"
      }
    }
  },
  {
    "id": "clock-overnight-gap-8",
    "english": "The date of event ON-gap-8 is 2026-03-29. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:00 civil time in Europe/London.",
    "ainglish": "The date of event ON-gap-8 is 2026-03-29. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:00@Europe/London.",
    "question": "How many actual UTC instants match that civil reading on the supplied date? A = no matching instant. B = one matching instant. C = two matching instants. D = the message guarantees a duration.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "A",
    "settlement_stratum": "gap",
    "strata": {
      "condition": "gap",
      "frame_cluster": "clock-gap-8",
      "date": "2026-03-29",
      "zone": "Europe/London",
      "clock": "01:00",
      "matching_instants": [],
      "semantic_gold": "no matching instant",
      "answer_options": {
        "A": "no matching instant",
        "B": "one matching instant",
        "C": "two matching instants",
        "D": "the message guarantees a duration"
      }
    }
  },
  {
    "id": "clock-overnight-gap-9",
    "english": "The date of event ON-gap-9 is 2026-03-29. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:15 civil time in Europe/London.",
    "ainglish": "The date of event ON-gap-9 is 2026-03-29. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:15@Europe/London.",
    "question": "How many actual UTC instants match that civil reading on the supplied date? A = one matching instant. B = no matching instant. C = two matching instants. D = the message guarantees a duration.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "B",
    "settlement_stratum": "gap",
    "strata": {
      "condition": "gap",
      "frame_cluster": "clock-gap-9",
      "date": "2026-03-29",
      "zone": "Europe/London",
      "clock": "01:15",
      "matching_instants": [],
      "semantic_gold": "no matching instant",
      "answer_options": {
        "A": "one matching instant",
        "B": "no matching instant",
        "C": "two matching instants",
        "D": "the message guarantees a duration"
      }
    }
  },
  {
    "id": "clock-overnight-gap-10",
    "english": "The date of event ON-gap-10 is 2026-03-29. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:30 civil time in Europe/London.",
    "ainglish": "The date of event ON-gap-10 is 2026-03-29. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:30@Europe/London.",
    "question": "How many actual UTC instants match that civil reading on the supplied date? A = one matching instant. B = two matching instants. C = no matching instant. D = the message guarantees a duration.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "C",
    "settlement_stratum": "gap",
    "strata": {
      "condition": "gap",
      "frame_cluster": "clock-gap-10",
      "date": "2026-03-29",
      "zone": "Europe/London",
      "clock": "01:30",
      "matching_instants": [],
      "semantic_gold": "no matching instant",
      "answer_options": {
        "A": "one matching instant",
        "B": "two matching instants",
        "C": "no matching instant",
        "D": "the message guarantees a duration"
      }
    }
  },
  {
    "id": "clock-overnight-gap-11",
    "english": "The date of event ON-gap-11 is 2026-03-29. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:45 civil time in Europe/London.",
    "ainglish": "The date of event ON-gap-11 is 2026-03-29. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:45@Europe/London.",
    "question": "How many actual UTC instants match that civil reading on the supplied date? A = one matching instant. B = two matching instants. C = the message guarantees a duration. D = no matching instant.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "D",
    "settlement_stratum": "gap",
    "strata": {
      "condition": "gap",
      "frame_cluster": "clock-gap-11",
      "date": "2026-03-29",
      "zone": "Europe/London",
      "clock": "01:45",
      "matching_instants": [],
      "semantic_gold": "no matching instant",
      "answer_options": {
        "A": "one matching instant",
        "B": "two matching instants",
        "C": "the message guarantees a duration",
        "D": "no matching instant"
      }
    }
  },
  {
    "id": "clock-overnight-gap-12",
    "english": "The date of event ON-gap-12 is 2026-03-29. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:00 civil time in Europe/London.",
    "ainglish": "The date of event ON-gap-12 is 2026-03-29. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:00@Europe/London.",
    "question": "How many actual UTC instants match that civil reading on the supplied date? A = no matching instant. B = one matching instant. C = two matching instants. D = the message guarantees a duration.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "A",
    "settlement_stratum": "gap",
    "strata": {
      "condition": "gap",
      "frame_cluster": "clock-gap-12",
      "date": "2026-03-29",
      "zone": "Europe/London",
      "clock": "01:00",
      "matching_instants": [],
      "semantic_gold": "no matching instant",
      "answer_options": {
        "A": "no matching instant",
        "B": "one matching instant",
        "C": "two matching instants",
        "D": "the message guarantees a duration"
      }
    }
  },
  {
    "id": "clock-overnight-gap-13",
    "english": "The date of event ON-gap-13 is 2026-03-29. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:15 civil time in Europe/London.",
    "ainglish": "The date of event ON-gap-13 is 2026-03-29. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:15@Europe/London.",
    "question": "How many actual UTC instants match that civil reading on the supplied date? A = one matching instant. B = no matching instant. C = two matching instants. D = the message guarantees a duration.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "B",
    "settlement_stratum": "gap",
    "strata": {
      "condition": "gap",
      "frame_cluster": "clock-gap-13",
      "date": "2026-03-29",
      "zone": "Europe/London",
      "clock": "01:15",
      "matching_instants": [],
      "semantic_gold": "no matching instant",
      "answer_options": {
        "A": "one matching instant",
        "B": "no matching instant",
        "C": "two matching instants",
        "D": "the message guarantees a duration"
      }
    }
  },
  {
    "id": "clock-overnight-gap-14",
    "english": "The date of event ON-gap-14 is 2026-03-29. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:30 civil time in Europe/London.",
    "ainglish": "The date of event ON-gap-14 is 2026-03-29. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:30@Europe/London.",
    "question": "How many actual UTC instants match that civil reading on the supplied date? A = one matching instant. B = two matching instants. C = no matching instant. D = the message guarantees a duration.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "C",
    "settlement_stratum": "gap",
    "strata": {
      "condition": "gap",
      "frame_cluster": "clock-gap-14",
      "date": "2026-03-29",
      "zone": "Europe/London",
      "clock": "01:30",
      "matching_instants": [],
      "semantic_gold": "no matching instant",
      "answer_options": {
        "A": "one matching instant",
        "B": "two matching instants",
        "C": "no matching instant",
        "D": "the message guarantees a duration"
      }
    }
  },
  {
    "id": "clock-overnight-gap-15",
    "english": "The date of event ON-gap-15 is 2026-03-29. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:45 civil time in Europe/London.",
    "ainglish": "The date of event ON-gap-15 is 2026-03-29. No UTC offset, fold selector or gap-adjustment policy is supplied. Time: 01:45@Europe/London.",
    "question": "How many actual UTC instants match that civil reading on the supplied date? A = one matching instant. B = two matching instants. C = the message guarantees a duration. D = no matching instant.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "D",
    "settlement_stratum": "gap",
    "strata": {
      "condition": "gap",
      "frame_cluster": "clock-gap-15",
      "date": "2026-03-29",
      "zone": "Europe/London",
      "clock": "01:45",
      "matching_instants": [],
      "semantic_gold": "no matching instant",
      "answer_options": {
        "A": "one matching instant",
        "B": "two matching instants",
        "C": "the message guarantees a duration",
        "D": "no matching instant"
      }
    }
  },
  {
    "id": "clock-overnight-recurring-civil-0",
    "english": "event ON-recurring-civil-0 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 09:00 London civil time, using the offset applicable on each date.",
    "ainglish": "event ON-recurring-civil-0 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 09:00@Europe/London.",
    "question": "Which clock reading is held fixed across those winter and summer dates? A = the London clock reading stays fixed. B = the UTC clock reading stays fixed. C = both clock readings stay fixed. D = neither is constrained.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "A",
    "settlement_stratum": "recurring-civil",
    "strata": {
      "condition": "recurring-civil",
      "frame_cluster": "clock-recurring-civil-0",
      "date": "2026-01-15",
      "zone": "Europe/London",
      "clock": "09:00",
      "semantic_gold": "the London clock reading stays fixed",
      "answer_options": {
        "A": "the London clock reading stays fixed",
        "B": "the UTC clock reading stays fixed",
        "C": "both clock readings stay fixed",
        "D": "neither is constrained"
      }
    }
  },
  {
    "id": "clock-overnight-recurring-civil-1",
    "english": "event ON-recurring-civil-1 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 10:15 London civil time, using the offset applicable on each date.",
    "ainglish": "event ON-recurring-civil-1 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 10:15@Europe/London.",
    "question": "Which clock reading is held fixed across those winter and summer dates? A = the UTC clock reading stays fixed. B = the London clock reading stays fixed. C = both clock readings stay fixed. D = neither is constrained.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "B",
    "settlement_stratum": "recurring-civil",
    "strata": {
      "condition": "recurring-civil",
      "frame_cluster": "clock-recurring-civil-1",
      "date": "2026-07-15",
      "zone": "Europe/London",
      "clock": "10:15",
      "semantic_gold": "the London clock reading stays fixed",
      "answer_options": {
        "A": "the UTC clock reading stays fixed",
        "B": "the London clock reading stays fixed",
        "C": "both clock readings stay fixed",
        "D": "neither is constrained"
      }
    }
  },
  {
    "id": "clock-overnight-recurring-civil-2",
    "english": "event ON-recurring-civil-2 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 11:30 London civil time, using the offset applicable on each date.",
    "ainglish": "event ON-recurring-civil-2 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 11:30@Europe/London.",
    "question": "Which clock reading is held fixed across those winter and summer dates? A = the UTC clock reading stays fixed. B = both clock readings stay fixed. C = the London clock reading stays fixed. D = neither is constrained.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "C",
    "settlement_stratum": "recurring-civil",
    "strata": {
      "condition": "recurring-civil",
      "frame_cluster": "clock-recurring-civil-2",
      "date": "2026-01-15",
      "zone": "America/New_York",
      "clock": "11:30",
      "semantic_gold": "the London clock reading stays fixed",
      "answer_options": {
        "A": "the UTC clock reading stays fixed",
        "B": "both clock readings stay fixed",
        "C": "the London clock reading stays fixed",
        "D": "neither is constrained"
      }
    }
  },
  {
    "id": "clock-overnight-recurring-civil-3",
    "english": "event ON-recurring-civil-3 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 12:45 London civil time, using the offset applicable on each date.",
    "ainglish": "event ON-recurring-civil-3 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 12:45@Europe/London.",
    "question": "Which clock reading is held fixed across those winter and summer dates? A = the UTC clock reading stays fixed. B = both clock readings stay fixed. C = neither is constrained. D = the London clock reading stays fixed.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "D",
    "settlement_stratum": "recurring-civil",
    "strata": {
      "condition": "recurring-civil",
      "frame_cluster": "clock-recurring-civil-3",
      "date": "2026-07-15",
      "zone": "America/New_York",
      "clock": "12:45",
      "semantic_gold": "the London clock reading stays fixed",
      "answer_options": {
        "A": "the UTC clock reading stays fixed",
        "B": "both clock readings stay fixed",
        "C": "neither is constrained",
        "D": "the London clock reading stays fixed"
      }
    }
  },
  {
    "id": "clock-overnight-recurring-civil-4",
    "english": "event ON-recurring-civil-4 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 13:00 London civil time, using the offset applicable on each date.",
    "ainglish": "event ON-recurring-civil-4 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 13:00@Europe/London.",
    "question": "Which clock reading is held fixed across those winter and summer dates? A = the London clock reading stays fixed. B = the UTC clock reading stays fixed. C = both clock readings stay fixed. D = neither is constrained.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "A",
    "settlement_stratum": "recurring-civil",
    "strata": {
      "condition": "recurring-civil",
      "frame_cluster": "clock-recurring-civil-4",
      "date": "2026-01-15",
      "zone": "Asia/Kolkata",
      "clock": "13:00",
      "semantic_gold": "the London clock reading stays fixed",
      "answer_options": {
        "A": "the London clock reading stays fixed",
        "B": "the UTC clock reading stays fixed",
        "C": "both clock readings stay fixed",
        "D": "neither is constrained"
      }
    }
  },
  {
    "id": "clock-overnight-recurring-civil-5",
    "english": "event ON-recurring-civil-5 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 09:15 London civil time, using the offset applicable on each date.",
    "ainglish": "event ON-recurring-civil-5 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 09:15@Europe/London.",
    "question": "Which clock reading is held fixed across those winter and summer dates? A = the UTC clock reading stays fixed. B = the London clock reading stays fixed. C = both clock readings stay fixed. D = neither is constrained.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "B",
    "settlement_stratum": "recurring-civil",
    "strata": {
      "condition": "recurring-civil",
      "frame_cluster": "clock-recurring-civil-5",
      "date": "2026-07-15",
      "zone": "Asia/Kolkata",
      "clock": "09:15",
      "semantic_gold": "the London clock reading stays fixed",
      "answer_options": {
        "A": "the UTC clock reading stays fixed",
        "B": "the London clock reading stays fixed",
        "C": "both clock readings stay fixed",
        "D": "neither is constrained"
      }
    }
  },
  {
    "id": "clock-overnight-recurring-civil-6",
    "english": "event ON-recurring-civil-6 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 10:30 London civil time, using the offset applicable on each date.",
    "ainglish": "event ON-recurring-civil-6 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 10:30@Europe/London.",
    "question": "Which clock reading is held fixed across those winter and summer dates? A = the UTC clock reading stays fixed. B = both clock readings stay fixed. C = the London clock reading stays fixed. D = neither is constrained.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "C",
    "settlement_stratum": "recurring-civil",
    "strata": {
      "condition": "recurring-civil",
      "frame_cluster": "clock-recurring-civil-6",
      "date": "2026-01-15",
      "zone": "Australia/Sydney",
      "clock": "10:30",
      "semantic_gold": "the London clock reading stays fixed",
      "answer_options": {
        "A": "the UTC clock reading stays fixed",
        "B": "both clock readings stay fixed",
        "C": "the London clock reading stays fixed",
        "D": "neither is constrained"
      }
    }
  },
  {
    "id": "clock-overnight-recurring-civil-7",
    "english": "event ON-recurring-civil-7 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 11:45 London civil time, using the offset applicable on each date.",
    "ainglish": "event ON-recurring-civil-7 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 11:45@Europe/London.",
    "question": "Which clock reading is held fixed across those winter and summer dates? A = the UTC clock reading stays fixed. B = both clock readings stay fixed. C = neither is constrained. D = the London clock reading stays fixed.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "D",
    "settlement_stratum": "recurring-civil",
    "strata": {
      "condition": "recurring-civil",
      "frame_cluster": "clock-recurring-civil-7",
      "date": "2026-07-15",
      "zone": "Australia/Sydney",
      "clock": "11:45",
      "semantic_gold": "the London clock reading stays fixed",
      "answer_options": {
        "A": "the UTC clock reading stays fixed",
        "B": "both clock readings stay fixed",
        "C": "neither is constrained",
        "D": "the London clock reading stays fixed"
      }
    }
  },
  {
    "id": "clock-overnight-recurring-civil-8",
    "english": "event ON-recurring-civil-8 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 12:00 London civil time, using the offset applicable on each date.",
    "ainglish": "event ON-recurring-civil-8 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 12:00@Europe/London.",
    "question": "Which clock reading is held fixed across those winter and summer dates? A = the London clock reading stays fixed. B = the UTC clock reading stays fixed. C = both clock readings stay fixed. D = neither is constrained.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "A",
    "settlement_stratum": "recurring-civil",
    "strata": {
      "condition": "recurring-civil",
      "frame_cluster": "clock-recurring-civil-8",
      "date": "2026-01-15",
      "zone": "Europe/London",
      "clock": "12:00",
      "semantic_gold": "the London clock reading stays fixed",
      "answer_options": {
        "A": "the London clock reading stays fixed",
        "B": "the UTC clock reading stays fixed",
        "C": "both clock readings stay fixed",
        "D": "neither is constrained"
      }
    }
  },
  {
    "id": "clock-overnight-recurring-civil-9",
    "english": "event ON-recurring-civil-9 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 13:15 London civil time, using the offset applicable on each date.",
    "ainglish": "event ON-recurring-civil-9 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 13:15@Europe/London.",
    "question": "Which clock reading is held fixed across those winter and summer dates? A = the UTC clock reading stays fixed. B = the London clock reading stays fixed. C = both clock readings stay fixed. D = neither is constrained.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "B",
    "settlement_stratum": "recurring-civil",
    "strata": {
      "condition": "recurring-civil",
      "frame_cluster": "clock-recurring-civil-9",
      "date": "2026-07-15",
      "zone": "Europe/London",
      "clock": "13:15",
      "semantic_gold": "the London clock reading stays fixed",
      "answer_options": {
        "A": "the UTC clock reading stays fixed",
        "B": "the London clock reading stays fixed",
        "C": "both clock readings stay fixed",
        "D": "neither is constrained"
      }
    }
  },
  {
    "id": "clock-overnight-recurring-civil-10",
    "english": "event ON-recurring-civil-10 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 09:30 London civil time, using the offset applicable on each date.",
    "ainglish": "event ON-recurring-civil-10 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 09:30@Europe/London.",
    "question": "Which clock reading is held fixed across those winter and summer dates? A = the UTC clock reading stays fixed. B = both clock readings stay fixed. C = the London clock reading stays fixed. D = neither is constrained.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "C",
    "settlement_stratum": "recurring-civil",
    "strata": {
      "condition": "recurring-civil",
      "frame_cluster": "clock-recurring-civil-10",
      "date": "2026-01-15",
      "zone": "America/New_York",
      "clock": "09:30",
      "semantic_gold": "the London clock reading stays fixed",
      "answer_options": {
        "A": "the UTC clock reading stays fixed",
        "B": "both clock readings stay fixed",
        "C": "the London clock reading stays fixed",
        "D": "neither is constrained"
      }
    }
  },
  {
    "id": "clock-overnight-recurring-civil-11",
    "english": "event ON-recurring-civil-11 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 10:45 London civil time, using the offset applicable on each date.",
    "ainglish": "event ON-recurring-civil-11 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 10:45@Europe/London.",
    "question": "Which clock reading is held fixed across those winter and summer dates? A = the UTC clock reading stays fixed. B = both clock readings stay fixed. C = neither is constrained. D = the London clock reading stays fixed.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "D",
    "settlement_stratum": "recurring-civil",
    "strata": {
      "condition": "recurring-civil",
      "frame_cluster": "clock-recurring-civil-11",
      "date": "2026-07-15",
      "zone": "America/New_York",
      "clock": "10:45",
      "semantic_gold": "the London clock reading stays fixed",
      "answer_options": {
        "A": "the UTC clock reading stays fixed",
        "B": "both clock readings stay fixed",
        "C": "neither is constrained",
        "D": "the London clock reading stays fixed"
      }
    }
  },
  {
    "id": "clock-overnight-recurring-civil-12",
    "english": "event ON-recurring-civil-12 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 11:00 London civil time, using the offset applicable on each date.",
    "ainglish": "event ON-recurring-civil-12 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 11:00@Europe/London.",
    "question": "Which clock reading is held fixed across those winter and summer dates? A = the London clock reading stays fixed. B = the UTC clock reading stays fixed. C = both clock readings stay fixed. D = neither is constrained.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "A",
    "settlement_stratum": "recurring-civil",
    "strata": {
      "condition": "recurring-civil",
      "frame_cluster": "clock-recurring-civil-12",
      "date": "2026-01-15",
      "zone": "Asia/Kolkata",
      "clock": "11:00",
      "semantic_gold": "the London clock reading stays fixed",
      "answer_options": {
        "A": "the London clock reading stays fixed",
        "B": "the UTC clock reading stays fixed",
        "C": "both clock readings stay fixed",
        "D": "neither is constrained"
      }
    }
  },
  {
    "id": "clock-overnight-recurring-civil-13",
    "english": "event ON-recurring-civil-13 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 12:15 London civil time, using the offset applicable on each date.",
    "ainglish": "event ON-recurring-civil-13 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 12:15@Europe/London.",
    "question": "Which clock reading is held fixed across those winter and summer dates? A = the UTC clock reading stays fixed. B = the London clock reading stays fixed. C = both clock readings stay fixed. D = neither is constrained.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "B",
    "settlement_stratum": "recurring-civil",
    "strata": {
      "condition": "recurring-civil",
      "frame_cluster": "clock-recurring-civil-13",
      "date": "2026-07-15",
      "zone": "Asia/Kolkata",
      "clock": "12:15",
      "semantic_gold": "the London clock reading stays fixed",
      "answer_options": {
        "A": "the UTC clock reading stays fixed",
        "B": "the London clock reading stays fixed",
        "C": "both clock readings stay fixed",
        "D": "neither is constrained"
      }
    }
  },
  {
    "id": "clock-overnight-recurring-civil-14",
    "english": "event ON-recurring-civil-14 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 13:30 London civil time, using the offset applicable on each date.",
    "ainglish": "event ON-recurring-civil-14 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 13:30@Europe/London.",
    "question": "Which clock reading is held fixed across those winter and summer dates? A = the UTC clock reading stays fixed. B = both clock readings stay fixed. C = the London clock reading stays fixed. D = neither is constrained.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "C",
    "settlement_stratum": "recurring-civil",
    "strata": {
      "condition": "recurring-civil",
      "frame_cluster": "clock-recurring-civil-14",
      "date": "2026-01-15",
      "zone": "Australia/Sydney",
      "clock": "13:30",
      "semantic_gold": "the London clock reading stays fixed",
      "answer_options": {
        "A": "the UTC clock reading stays fixed",
        "B": "both clock readings stay fixed",
        "C": "the London clock reading stays fixed",
        "D": "neither is constrained"
      }
    }
  },
  {
    "id": "clock-overnight-recurring-civil-15",
    "english": "event ON-recurring-civil-15 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 09:45 London civil time, using the offset applicable on each date.",
    "ainglish": "event ON-recurring-civil-15 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 09:45@Europe/London.",
    "question": "Which clock reading is held fixed across those winter and summer dates? A = the UTC clock reading stays fixed. B = both clock readings stay fixed. C = neither is constrained. D = the London clock reading stays fixed.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "D",
    "settlement_stratum": "recurring-civil",
    "strata": {
      "condition": "recurring-civil",
      "frame_cluster": "clock-recurring-civil-15",
      "date": "2026-07-15",
      "zone": "Australia/Sydney",
      "clock": "09:45",
      "semantic_gold": "the London clock reading stays fixed",
      "answer_options": {
        "A": "the UTC clock reading stays fixed",
        "B": "both clock readings stay fixed",
        "C": "neither is constrained",
        "D": "the London clock reading stays fixed"
      }
    }
  },
  {
    "id": "clock-overnight-recurring-utc-0",
    "english": "event ON-recurring-utc-0 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 09:00 UTC.",
    "ainglish": "event ON-recurring-utc-0 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 09:00Z.",
    "question": "Which clock reading is held fixed across those winter and summer dates? A = the UTC clock reading stays fixed. B = the London clock reading stays fixed. C = both clock readings stay fixed. D = neither is constrained.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "A",
    "settlement_stratum": "recurring-utc",
    "strata": {
      "condition": "recurring-utc",
      "frame_cluster": "clock-recurring-utc-0",
      "date": "2026-01-15",
      "zone": "Europe/London",
      "clock": "09:00",
      "semantic_gold": "the UTC clock reading stays fixed",
      "answer_options": {
        "A": "the UTC clock reading stays fixed",
        "B": "the London clock reading stays fixed",
        "C": "both clock readings stay fixed",
        "D": "neither is constrained"
      }
    }
  },
  {
    "id": "clock-overnight-recurring-utc-1",
    "english": "event ON-recurring-utc-1 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 10:15 UTC.",
    "ainglish": "event ON-recurring-utc-1 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 10:15Z.",
    "question": "Which clock reading is held fixed across those winter and summer dates? A = the London clock reading stays fixed. B = the UTC clock reading stays fixed. C = both clock readings stay fixed. D = neither is constrained.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "B",
    "settlement_stratum": "recurring-utc",
    "strata": {
      "condition": "recurring-utc",
      "frame_cluster": "clock-recurring-utc-1",
      "date": "2026-07-15",
      "zone": "Europe/London",
      "clock": "10:15",
      "semantic_gold": "the UTC clock reading stays fixed",
      "answer_options": {
        "A": "the London clock reading stays fixed",
        "B": "the UTC clock reading stays fixed",
        "C": "both clock readings stay fixed",
        "D": "neither is constrained"
      }
    }
  },
  {
    "id": "clock-overnight-recurring-utc-2",
    "english": "event ON-recurring-utc-2 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 11:30 UTC.",
    "ainglish": "event ON-recurring-utc-2 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 11:30Z.",
    "question": "Which clock reading is held fixed across those winter and summer dates? A = the London clock reading stays fixed. B = both clock readings stay fixed. C = the UTC clock reading stays fixed. D = neither is constrained.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "C",
    "settlement_stratum": "recurring-utc",
    "strata": {
      "condition": "recurring-utc",
      "frame_cluster": "clock-recurring-utc-2",
      "date": "2026-01-15",
      "zone": "America/New_York",
      "clock": "11:30",
      "semantic_gold": "the UTC clock reading stays fixed",
      "answer_options": {
        "A": "the London clock reading stays fixed",
        "B": "both clock readings stay fixed",
        "C": "the UTC clock reading stays fixed",
        "D": "neither is constrained"
      }
    }
  },
  {
    "id": "clock-overnight-recurring-utc-3",
    "english": "event ON-recurring-utc-3 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 12:45 UTC.",
    "ainglish": "event ON-recurring-utc-3 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 12:45Z.",
    "question": "Which clock reading is held fixed across those winter and summer dates? A = the London clock reading stays fixed. B = both clock readings stay fixed. C = neither is constrained. D = the UTC clock reading stays fixed.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "D",
    "settlement_stratum": "recurring-utc",
    "strata": {
      "condition": "recurring-utc",
      "frame_cluster": "clock-recurring-utc-3",
      "date": "2026-07-15",
      "zone": "America/New_York",
      "clock": "12:45",
      "semantic_gold": "the UTC clock reading stays fixed",
      "answer_options": {
        "A": "the London clock reading stays fixed",
        "B": "both clock readings stay fixed",
        "C": "neither is constrained",
        "D": "the UTC clock reading stays fixed"
      }
    }
  },
  {
    "id": "clock-overnight-recurring-utc-4",
    "english": "event ON-recurring-utc-4 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 13:00 UTC.",
    "ainglish": "event ON-recurring-utc-4 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 13:00Z.",
    "question": "Which clock reading is held fixed across those winter and summer dates? A = the UTC clock reading stays fixed. B = the London clock reading stays fixed. C = both clock readings stay fixed. D = neither is constrained.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "A",
    "settlement_stratum": "recurring-utc",
    "strata": {
      "condition": "recurring-utc",
      "frame_cluster": "clock-recurring-utc-4",
      "date": "2026-01-15",
      "zone": "Asia/Kolkata",
      "clock": "13:00",
      "semantic_gold": "the UTC clock reading stays fixed",
      "answer_options": {
        "A": "the UTC clock reading stays fixed",
        "B": "the London clock reading stays fixed",
        "C": "both clock readings stay fixed",
        "D": "neither is constrained"
      }
    }
  },
  {
    "id": "clock-overnight-recurring-utc-5",
    "english": "event ON-recurring-utc-5 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 09:15 UTC.",
    "ainglish": "event ON-recurring-utc-5 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 09:15Z.",
    "question": "Which clock reading is held fixed across those winter and summer dates? A = the London clock reading stays fixed. B = the UTC clock reading stays fixed. C = both clock readings stay fixed. D = neither is constrained.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "B",
    "settlement_stratum": "recurring-utc",
    "strata": {
      "condition": "recurring-utc",
      "frame_cluster": "clock-recurring-utc-5",
      "date": "2026-07-15",
      "zone": "Asia/Kolkata",
      "clock": "09:15",
      "semantic_gold": "the UTC clock reading stays fixed",
      "answer_options": {
        "A": "the London clock reading stays fixed",
        "B": "the UTC clock reading stays fixed",
        "C": "both clock readings stay fixed",
        "D": "neither is constrained"
      }
    }
  },
  {
    "id": "clock-overnight-recurring-utc-6",
    "english": "event ON-recurring-utc-6 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 10:30 UTC.",
    "ainglish": "event ON-recurring-utc-6 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 10:30Z.",
    "question": "Which clock reading is held fixed across those winter and summer dates? A = the London clock reading stays fixed. B = both clock readings stay fixed. C = the UTC clock reading stays fixed. D = neither is constrained.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "C",
    "settlement_stratum": "recurring-utc",
    "strata": {
      "condition": "recurring-utc",
      "frame_cluster": "clock-recurring-utc-6",
      "date": "2026-01-15",
      "zone": "Australia/Sydney",
      "clock": "10:30",
      "semantic_gold": "the UTC clock reading stays fixed",
      "answer_options": {
        "A": "the London clock reading stays fixed",
        "B": "both clock readings stay fixed",
        "C": "the UTC clock reading stays fixed",
        "D": "neither is constrained"
      }
    }
  },
  {
    "id": "clock-overnight-recurring-utc-7",
    "english": "event ON-recurring-utc-7 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 11:45 UTC.",
    "ainglish": "event ON-recurring-utc-7 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 11:45Z.",
    "question": "Which clock reading is held fixed across those winter and summer dates? A = the London clock reading stays fixed. B = both clock readings stay fixed. C = neither is constrained. D = the UTC clock reading stays fixed.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "D",
    "settlement_stratum": "recurring-utc",
    "strata": {
      "condition": "recurring-utc",
      "frame_cluster": "clock-recurring-utc-7",
      "date": "2026-07-15",
      "zone": "Australia/Sydney",
      "clock": "11:45",
      "semantic_gold": "the UTC clock reading stays fixed",
      "answer_options": {
        "A": "the London clock reading stays fixed",
        "B": "both clock readings stay fixed",
        "C": "neither is constrained",
        "D": "the UTC clock reading stays fixed"
      }
    }
  },
  {
    "id": "clock-overnight-recurring-utc-8",
    "english": "event ON-recurring-utc-8 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 12:00 UTC.",
    "ainglish": "event ON-recurring-utc-8 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 12:00Z.",
    "question": "Which clock reading is held fixed across those winter and summer dates? A = the UTC clock reading stays fixed. B = the London clock reading stays fixed. C = both clock readings stay fixed. D = neither is constrained.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "A",
    "settlement_stratum": "recurring-utc",
    "strata": {
      "condition": "recurring-utc",
      "frame_cluster": "clock-recurring-utc-8",
      "date": "2026-01-15",
      "zone": "Europe/London",
      "clock": "12:00",
      "semantic_gold": "the UTC clock reading stays fixed",
      "answer_options": {
        "A": "the UTC clock reading stays fixed",
        "B": "the London clock reading stays fixed",
        "C": "both clock readings stay fixed",
        "D": "neither is constrained"
      }
    }
  },
  {
    "id": "clock-overnight-recurring-utc-9",
    "english": "event ON-recurring-utc-9 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 13:15 UTC.",
    "ainglish": "event ON-recurring-utc-9 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 13:15Z.",
    "question": "Which clock reading is held fixed across those winter and summer dates? A = the London clock reading stays fixed. B = the UTC clock reading stays fixed. C = both clock readings stay fixed. D = neither is constrained.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "B",
    "settlement_stratum": "recurring-utc",
    "strata": {
      "condition": "recurring-utc",
      "frame_cluster": "clock-recurring-utc-9",
      "date": "2026-07-15",
      "zone": "Europe/London",
      "clock": "13:15",
      "semantic_gold": "the UTC clock reading stays fixed",
      "answer_options": {
        "A": "the London clock reading stays fixed",
        "B": "the UTC clock reading stays fixed",
        "C": "both clock readings stay fixed",
        "D": "neither is constrained"
      }
    }
  },
  {
    "id": "clock-overnight-recurring-utc-10",
    "english": "event ON-recurring-utc-10 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 09:30 UTC.",
    "ainglish": "event ON-recurring-utc-10 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 09:30Z.",
    "question": "Which clock reading is held fixed across those winter and summer dates? A = the London clock reading stays fixed. B = both clock readings stay fixed. C = the UTC clock reading stays fixed. D = neither is constrained.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "C",
    "settlement_stratum": "recurring-utc",
    "strata": {
      "condition": "recurring-utc",
      "frame_cluster": "clock-recurring-utc-10",
      "date": "2026-01-15",
      "zone": "America/New_York",
      "clock": "09:30",
      "semantic_gold": "the UTC clock reading stays fixed",
      "answer_options": {
        "A": "the London clock reading stays fixed",
        "B": "both clock readings stay fixed",
        "C": "the UTC clock reading stays fixed",
        "D": "neither is constrained"
      }
    }
  },
  {
    "id": "clock-overnight-recurring-utc-11",
    "english": "event ON-recurring-utc-11 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 10:45 UTC.",
    "ainglish": "event ON-recurring-utc-11 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 10:45Z.",
    "question": "Which clock reading is held fixed across those winter and summer dates? A = the London clock reading stays fixed. B = both clock readings stay fixed. C = neither is constrained. D = the UTC clock reading stays fixed.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "D",
    "settlement_stratum": "recurring-utc",
    "strata": {
      "condition": "recurring-utc",
      "frame_cluster": "clock-recurring-utc-11",
      "date": "2026-07-15",
      "zone": "America/New_York",
      "clock": "10:45",
      "semantic_gold": "the UTC clock reading stays fixed",
      "answer_options": {
        "A": "the London clock reading stays fixed",
        "B": "both clock readings stay fixed",
        "C": "neither is constrained",
        "D": "the UTC clock reading stays fixed"
      }
    }
  },
  {
    "id": "clock-overnight-recurring-utc-12",
    "english": "event ON-recurring-utc-12 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 11:00 UTC.",
    "ainglish": "event ON-recurring-utc-12 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 11:00Z.",
    "question": "Which clock reading is held fixed across those winter and summer dates? A = the UTC clock reading stays fixed. B = the London clock reading stays fixed. C = both clock readings stay fixed. D = neither is constrained.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "A",
    "settlement_stratum": "recurring-utc",
    "strata": {
      "condition": "recurring-utc",
      "frame_cluster": "clock-recurring-utc-12",
      "date": "2026-01-15",
      "zone": "Asia/Kolkata",
      "clock": "11:00",
      "semantic_gold": "the UTC clock reading stays fixed",
      "answer_options": {
        "A": "the UTC clock reading stays fixed",
        "B": "the London clock reading stays fixed",
        "C": "both clock readings stay fixed",
        "D": "neither is constrained"
      }
    }
  },
  {
    "id": "clock-overnight-recurring-utc-13",
    "english": "event ON-recurring-utc-13 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 12:15 UTC.",
    "ainglish": "event ON-recurring-utc-13 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 12:15Z.",
    "question": "Which clock reading is held fixed across those winter and summer dates? A = the London clock reading stays fixed. B = the UTC clock reading stays fixed. C = both clock readings stay fixed. D = neither is constrained.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "B",
    "settlement_stratum": "recurring-utc",
    "strata": {
      "condition": "recurring-utc",
      "frame_cluster": "clock-recurring-utc-13",
      "date": "2026-07-15",
      "zone": "Asia/Kolkata",
      "clock": "12:15",
      "semantic_gold": "the UTC clock reading stays fixed",
      "answer_options": {
        "A": "the London clock reading stays fixed",
        "B": "the UTC clock reading stays fixed",
        "C": "both clock readings stay fixed",
        "D": "neither is constrained"
      }
    }
  },
  {
    "id": "clock-overnight-recurring-utc-14",
    "english": "event ON-recurring-utc-14 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 13:30 UTC.",
    "ainglish": "event ON-recurring-utc-14 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 13:30Z.",
    "question": "Which clock reading is held fixed across those winter and summer dates? A = the London clock reading stays fixed. B = both clock readings stay fixed. C = the UTC clock reading stays fixed. D = neither is constrained.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "C",
    "settlement_stratum": "recurring-utc",
    "strata": {
      "condition": "recurring-utc",
      "frame_cluster": "clock-recurring-utc-14",
      "date": "2026-01-15",
      "zone": "Australia/Sydney",
      "clock": "13:30",
      "semantic_gold": "the UTC clock reading stays fixed",
      "answer_options": {
        "A": "the London clock reading stays fixed",
        "B": "both clock readings stay fixed",
        "C": "the UTC clock reading stays fixed",
        "D": "neither is constrained"
      }
    }
  },
  {
    "id": "clock-overnight-recurring-utc-15",
    "english": "event ON-recurring-utc-15 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 09:45 UTC.",
    "ainglish": "event ON-recurring-utc-15 is a daily recurring meeting in London, including 15 January and 15 July 2026. Each meeting starts at 09:45Z.",
    "question": "Which clock reading is held fixed across those winter and summer dates? A = the London clock reading stays fixed. B = both clock readings stay fixed. C = neither is constrained. D = the UTC clock reading stays fixed.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "D",
    "settlement_stratum": "recurring-utc",
    "strata": {
      "condition": "recurring-utc",
      "frame_cluster": "clock-recurring-utc-15",
      "date": "2026-07-15",
      "zone": "Australia/Sydney",
      "clock": "09:45",
      "semantic_gold": "the UTC clock reading stays fixed",
      "answer_options": {
        "A": "the London clock reading stays fixed",
        "B": "both clock readings stay fixed",
        "C": "neither is constrained",
        "D": "the UTC clock reading stays fixed"
      }
    }
  },
  {
    "id": "study-clock.careful-0",
    "english": "Exactly one of study-clock.careful-person-0-K, study-clock.careful-person-0-L, study-clock.careful-person-0-M holds parcel study-clock.careful-0. The record does not identify its holder.",
    "ainglish": "Exactly one of study-clock.careful-person-0-K, study-clock.careful-person-0-L, study-clock.careful-person-0-M holds parcel study-clock.careful-0. The record identifies study-clock.careful-person-0-K as its holder.",
    "question": "Who holds parcel study-clock.careful-0, according to this record? A = study-clock.careful-person-0-K. B = not determined from the record. C = study-clock.careful-person-0-L. D = study-clock.careful-person-0-M.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "A",
    "calibration": true,
    "calibration_truth": {
      "detectable": "A",
      "other": "B"
    }
  },
  {
    "id": "study-clock.careful-1",
    "english": "Exactly one of study-clock.careful-person-1-L, study-clock.careful-person-1-M, study-clock.careful-person-1-K holds parcel study-clock.careful-1. The record does not identify its holder.",
    "ainglish": "Exactly one of study-clock.careful-person-1-L, study-clock.careful-person-1-M, study-clock.careful-person-1-K holds parcel study-clock.careful-1. The record identifies study-clock.careful-person-1-L as its holder.",
    "question": "Who holds parcel study-clock.careful-1, according to this record? A = study-clock.careful-person-1-L. B = study-clock.careful-person-1-K. C = not determined from the record. D = study-clock.careful-person-1-M.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "A",
    "calibration": true,
    "calibration_truth": {
      "detectable": "A",
      "other": "C"
    }
  },
  {
    "id": "study-clock.careful-2",
    "english": "Exactly one of study-clock.careful-person-2-M, study-clock.careful-person-2-K, study-clock.careful-person-2-L holds parcel study-clock.careful-2. The record does not identify its holder.",
    "ainglish": "Exactly one of study-clock.careful-person-2-M, study-clock.careful-person-2-K, study-clock.careful-person-2-L holds parcel study-clock.careful-2. The record identifies study-clock.careful-person-2-M as its holder.",
    "question": "Who holds parcel study-clock.careful-2, according to this record? A = study-clock.careful-person-2-M. B = study-clock.careful-person-2-K. C = study-clock.careful-person-2-L. D = not determined from the record.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "A",
    "calibration": true,
    "calibration_truth": {
      "detectable": "A",
      "other": "D"
    }
  },
  {
    "id": "study-clock.careful-3",
    "english": "Exactly one of study-clock.careful-person-3-K, study-clock.careful-person-3-L, study-clock.careful-person-3-M holds parcel study-clock.careful-3. The record does not identify its holder.",
    "ainglish": "Exactly one of study-clock.careful-person-3-K, study-clock.careful-person-3-L, study-clock.careful-person-3-M holds parcel study-clock.careful-3. The record identifies study-clock.careful-person-3-K as its holder.",
    "question": "Who holds parcel study-clock.careful-3, according to this record? A = not determined from the record. B = study-clock.careful-person-3-K. C = study-clock.careful-person-3-L. D = study-clock.careful-person-3-M.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "B",
    "calibration": true,
    "calibration_truth": {
      "detectable": "B",
      "other": "A"
    }
  },
  {
    "id": "study-clock.careful-4",
    "english": "Exactly one of study-clock.careful-person-4-L, study-clock.careful-person-4-M, study-clock.careful-person-4-K holds parcel study-clock.careful-4. The record does not identify its holder.",
    "ainglish": "Exactly one of study-clock.careful-person-4-L, study-clock.careful-person-4-M, study-clock.careful-person-4-K holds parcel study-clock.careful-4. The record identifies study-clock.careful-person-4-M as its holder.",
    "question": "Who holds parcel study-clock.careful-4, according to this record? A = study-clock.careful-person-4-K. B = study-clock.careful-person-4-M. C = not determined from the record. D = study-clock.careful-person-4-L.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "B",
    "calibration": true,
    "calibration_truth": {
      "detectable": "B",
      "other": "C"
    }
  },
  {
    "id": "study-clock.careful-5",
    "english": "Exactly one of study-clock.careful-person-5-M, study-clock.careful-person-5-K, study-clock.careful-person-5-L holds parcel study-clock.careful-5. The record does not identify its holder.",
    "ainglish": "Exactly one of study-clock.careful-person-5-M, study-clock.careful-person-5-K, study-clock.careful-person-5-L holds parcel study-clock.careful-5. The record identifies study-clock.careful-person-5-K as its holder.",
    "question": "Who holds parcel study-clock.careful-5, according to this record? A = study-clock.careful-person-5-L. B = study-clock.careful-person-5-K. C = study-clock.careful-person-5-M. D = not determined from the record.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "B",
    "calibration": true,
    "calibration_truth": {
      "detectable": "B",
      "other": "D"
    }
  },
  {
    "id": "study-clock.careful-6",
    "english": "Exactly one of study-clock.careful-person-6-K, study-clock.careful-person-6-L, study-clock.careful-person-6-M holds parcel study-clock.careful-6. The record does not identify its holder.",
    "ainglish": "Exactly one of study-clock.careful-person-6-K, study-clock.careful-person-6-L, study-clock.careful-person-6-M holds parcel study-clock.careful-6. The record identifies study-clock.careful-person-6-L as its holder.",
    "question": "Who holds parcel study-clock.careful-6, according to this record? A = not determined from the record. B = study-clock.careful-person-6-K. C = study-clock.careful-person-6-L. D = study-clock.careful-person-6-M.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "C",
    "calibration": true,
    "calibration_truth": {
      "detectable": "C",
      "other": "A"
    }
  },
  {
    "id": "study-clock.careful-7",
    "english": "Exactly one of study-clock.careful-person-7-L, study-clock.careful-person-7-M, study-clock.careful-person-7-K holds parcel study-clock.careful-7. The record does not identify its holder.",
    "ainglish": "Exactly one of study-clock.careful-person-7-L, study-clock.careful-person-7-M, study-clock.careful-person-7-K holds parcel study-clock.careful-7. The record identifies study-clock.careful-person-7-M as its holder.",
    "question": "Who holds parcel study-clock.careful-7, according to this record? A = study-clock.careful-person-7-K. B = not determined from the record. C = study-clock.careful-person-7-M. D = study-clock.careful-person-7-L.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "C",
    "calibration": true,
    "calibration_truth": {
      "detectable": "C",
      "other": "B"
    }
  },
  {
    "id": "study-clock.careful-8",
    "english": "Exactly one of study-clock.careful-person-8-M, study-clock.careful-person-8-K, study-clock.careful-person-8-L holds parcel study-clock.careful-8. The record does not identify its holder.",
    "ainglish": "Exactly one of study-clock.careful-person-8-M, study-clock.careful-person-8-K, study-clock.careful-person-8-L holds parcel study-clock.careful-8. The record identifies study-clock.careful-person-8-L as its holder.",
    "question": "Who holds parcel study-clock.careful-8, according to this record? A = study-clock.careful-person-8-K. B = study-clock.careful-person-8-M. C = study-clock.careful-person-8-L. D = not determined from the record.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "C",
    "calibration": true,
    "calibration_truth": {
      "detectable": "C",
      "other": "D"
    }
  },
  {
    "id": "study-clock.careful-9",
    "english": "Exactly one of study-clock.careful-person-9-K, study-clock.careful-person-9-L, study-clock.careful-person-9-M holds parcel study-clock.careful-9. The record does not identify its holder.",
    "ainglish": "Exactly one of study-clock.careful-person-9-K, study-clock.careful-person-9-L, study-clock.careful-person-9-M holds parcel study-clock.careful-9. The record identifies study-clock.careful-person-9-M as its holder.",
    "question": "Who holds parcel study-clock.careful-9, according to this record? A = not determined from the record. B = study-clock.careful-person-9-K. C = study-clock.careful-person-9-L. D = study-clock.careful-person-9-M.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "D",
    "calibration": true,
    "calibration_truth": {
      "detectable": "D",
      "other": "A"
    }
  },
  {
    "id": "study-clock.careful-10",
    "english": "Exactly one of study-clock.careful-person-10-L, study-clock.careful-person-10-M, study-clock.careful-person-10-K holds parcel study-clock.careful-10. The record does not identify its holder.",
    "ainglish": "Exactly one of study-clock.careful-person-10-L, study-clock.careful-person-10-M, study-clock.careful-person-10-K holds parcel study-clock.careful-10. The record identifies study-clock.careful-person-10-K as its holder.",
    "question": "Who holds parcel study-clock.careful-10, according to this record? A = study-clock.careful-person-10-L. B = not determined from the record. C = study-clock.careful-person-10-M. D = study-clock.careful-person-10-K.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "D",
    "calibration": true,
    "calibration_truth": {
      "detectable": "D",
      "other": "B"
    }
  },
  {
    "id": "study-clock.careful-11",
    "english": "Exactly one of study-clock.careful-person-11-M, study-clock.careful-person-11-K, study-clock.careful-person-11-L holds parcel study-clock.careful-11. The record does not identify its holder.",
    "ainglish": "Exactly one of study-clock.careful-person-11-M, study-clock.careful-person-11-K, study-clock.careful-person-11-L holds parcel study-clock.careful-11. The record identifies study-clock.careful-person-11-L as its holder.",
    "question": "Who holds parcel study-clock.careful-11, according to this record? A = study-clock.careful-person-11-K. B = study-clock.careful-person-11-M. C = not determined from the record. D = study-clock.careful-person-11-L.",
    "options": [
      "A",
      "B",
      "C",
      "D"
    ],
    "answer": "D",
    "calibration": true,
    "calibration_truth": {
      "detectable": "D",
      "other": "C"
    }
  }
]