1, 10, 14, 15, 16, 17, 19, 2, 21, 3, 4, 5, 7, 9
1, 10, 14, 15, 16, 17, 19, 2, 21, 3, 4, 5, 7, 9, 10, 2, 4, 5, 6, 7, 9