多
1-6 1-9
2-4 2-5 2-6 2-7 2-9
3-2 3-4 3-7
4-7 4-8
5-3 5-4 5-5 5-8 5-9
6-1
换
1-2 3 4 5
2-1 2 3
3-3 5 6 9
4-1 2 4 5 6
5-2 6 7
6-2 3 5 6 8 9