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Pentominous (Borders) (543)
Other names: Pentominoes
Instruction:
Divide the grid into pentominoes such that every cell in the grid is part of exactly one pentomino. 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). Some borders are given in the grid. Each border must separate two pentominoes. (It is possible for some pentomino shapes to never appear in the grid, or more than once.)