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