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        "type": "Feature",
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            "title": "Arch of Janus",
            "summary": "Ancient building in Rome",
            "reciprocal": true
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        "@id": "https://topostext.org/place/419125UIan",
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        "properties": {
            "title": "Ianus Quadrifons (Rome)",
            "summary": "Monumental archway of late 3rd/4th c. possibly of Constantine, called the Arco di Giano",
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