examples/metro-2012-09-19.sudoku


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

1 6 0  8 0 0  9 0 0
0 3 8  0 0 6  1 0 0
0 0 0  0 1 2  0 8 0

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