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Nurikabe (pair sums) (944)
Instruction:
Shade some cells black (leaving the other cells white) so that the grid is divided into non-overlapping regions; cells of the same color are considered in the same region if they are adjacent horizontally or vertically. Each white region must have exactly two given numbers. The area of each white region (in cells) must be the sum of the two given numbers that are in that region. All black cells must be in the same region. No 2×2 group of cells can be entirely shaded black.