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