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Double nurikabe (733)
Instruction:
Shade some empty cells black so that the grid is divided into white areas, each containing exactly one number and with the same area in cells as that number. Two white areas may only touch diagonally. All black cells must be connected with each other, but no 2×2 group of cells can be entirely shaded black.
In the grid below half of the numbers belong to one Nurikabe and the other half to the other Nurikabe. Decide which hint belongs to which puzzle and solve the two Nurikabe puzzles.