1, 2, 3
6, 7, 8, 9
6, 7, 8
16, 17, 18
1, 2
17
3, 4, 5, 6, 7, 8, 9, 10, 11, 12
1, 2, 3, 4
1, 2, 3, 4, 5, 6
1, 2, 3, 4, 5
