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Tetromino Division (377)
Instruction:
Divide the grid into tetrominoes such that every cell in the grid is part of exactly one tetromino. Some letters are given in the grid. Each tetromino must contain exactly one letter. All tetrominoes with the same shape (not counting rotations and reflections) must contain the same letter, and tetrominoes with different shapes must contain different letters.
The mapping of letters to tetrominoes has been supplied for you.