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