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Five Cells (Pentominous) (1241)
Instruction:
Divide the grid into pentominoes (contiguous regions of five cells) such that every cell is part of exactly one pentomino. A number in a cell indicates how many edges of that cell are part of a pentomino border. (It is possible for some pentomino shapes to never appear in the grid, or more than once.)
Pentominoes of the same shape (rotations and reflections of a pentomino count as the same shape) cannot touch each other along an edge (but they may touch diagonally).