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A disentanglement puzzle is a type of mechanical puzzle that involves disentangling one piece or set of pieces from another piece or set of pieces. The reverse problem of reassembling the puzzle can be as hard as—or even harder than—disentanglement. There are several different kinds of disentanglement puzzles, though a single puzzle may incorporate several of these features. ==Plate-and-ring puzzles== A plate-and-ring puzzle usually consists of three pieces: * one plate or similar displaying many holes and/or indentations * a closed or nearly closed ring or a similar item. The plate as well as the ring are usually made from metal. The ring has to be disentangled from the plate. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「disentanglement puzzle」の詳細全文を読む スポンサード リンク
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