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, 2, 3, 4, 5, 6, 7, 8, 9