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Pentominous (Borders) (543)
Other names: Pentominoes
Instruction:
Divide the grid into pentominoes (contiguous regions of five cells) such that every cell 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 letters may be given in the grid. Each letter must be part of a pentomino with that letter's shape. It is permissible for a pentomino to contain more than one letter or no letters at all. (It is possible for some pentomino shapes to never appear in the grid, or more than once.)
Some borders are given in the grid. Each border must separate two cells that belong to two different pentominoes.