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