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