Jisho

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Wikipedia definition
1. PolyominoA polyomino is a plane geometric figure formed by joining one or more equal squares edge to edge. It is a polyform whose cells are squares. It may be regarded as a finite subset of the regular square tiling with a connected interior. Polyominoes are classified according to how many cells they have: Polyominoes have been used in popular puzzles since at least 1907, and the enumeration of pentominoes is dated to antiquity.
Read “Polyomino” on English Wikipedia
Read “ポリオミノ” on Japanese Wikipedia
Read “Polyomino” on DBpedia

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