examples/metro-2012-06-04.sudoku


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

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

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