17-2
6-3
1-2
1-3
2-1
3-1
3-2
4-1
4-2
5-1
5-2
6-1
6-2
1-1
7-1
7-2
7-3
8-1
8-2
8-3
9-1
9-2
9-3
9-4

1 2 3