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