10
2 3 4 5  0
1 3 4 5  0
1 2 4 5  0
1 2 3 5  0
1 2 3 4  0
7 8 9 10 0
6 8 9 10 0
6 7 9 10 0
6 7 8 10 0
6 7 8 9  0