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Set Black (SB)

When you have marked a black cell, all the cells around it must be white.

3 1 3 2 6 4
1 2 6 3 3 5
3 1 1 5 4 1
3 4 2 6 3 3
2 6 3 1 5 4
2 5 3 1 2 4

3 1 3 2 6 4
1 2 6 3 3 5
3 1 1 5 4 1
3 4 2 6 3 3
2 6 3 1 5 4
2 5 3 1 2 4