1, 10, 11, 12, 13, 14, 15, 2, 3, 4, 5, 6, 7, 8, 9

1, 10, 11, 12, 13, 14, 15, 2, 3, 4, 5, 6, 7, 8, 9, 1, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 2, 20, 21, 22, 23, 24, 25, 26, 27, 28, 3, 30, 31, 32, 33, 34, 35, 37, 38, 39, 4, 5, 6, 7, 8, 9