examples/hard-2013-07-25.sudoku


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

0 8 0  0 0 1  5 0 0
3 0 0  0 0 0  0 8 1
4 0 0  0 6 0  0 0 0

0 0 9  1 0 0  2 0 0
0 0 0  0 5 0  0 0 0
0 0 0  0 0 0  6 0 0