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Mochikoro (274)

Instruction:
Shade some empty cells so that the remaining white cells form rectangles, including squares. Two white rectangles can only touch diagonally. All rectangles must be connected through their corners. Every cell with a number in it must be part of a rectangle of the same size. Every rectangle must contain at most one number. No 2×2 group of cells can be entirely shaded.

Reference: WPC 2017 (11)