3, 7, 8
3, 7, 8, 1, 2, 3, 4, 5, 6, 7
3, 7, 8, 1, 2, 3, 4, 5, 6, 7, 1, 11, 13, 14, 15, 16, 17, 2, 21, 3, 5, 6, 7