0,  1,  2,  3,  4,  5
 12, 13, 14, 15, 16, 17
 24, 25, 26, 27, 28, 29
 36, 37, 38, 39, 40, 41
 48, 49, 50, 51, 52, 53
 60, 61, 62, 63, 64, 65
  _,
  6,  7,  8,  9, 10, 11
 18, 19, 20, 21, 22, 23
 30, 31, 32, 33, 34, 35
 42, 43, 44, 45, 46, 47
 54, 55, 56, 57, 58, 59
 66, 67, 68, 69, 70, 71