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