SE-SKOLORNAS 1992 Problem 2
The squares in a grid are numbered from to , where the first digit is the row and the second the column. Each square is colored black or white. Squares and are black. Every black square shares an edge with at most one other black square, and each white square shares an edge with at most one other white square. What color is square ?
Dataset text AI-MO AoPS. Quoted with source.
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