examples/metro-2012-08-10.sudoku


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

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

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