examples/metro-2013-04-29.sudoku


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

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

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