Pentomino

A geometric shape comprised of five (greek pente) identical squares, connected orthogonally. Compare to a domino (two squares), tetromino (four squares), or polyomino? (any number of squares).

A standard pentomino puzzle is to arrange a set of the twelve possible shapes into a rectangles without holes: 3x20, 4x15, 5x12, 6x10.

The shapes look like this:

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