examples/metro-2012-09-21.sudoku


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

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

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