Jisho

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Expressions (phrases, clauses, etc.), Noun
1. disentanglement puzzle; wire puzzle
Wikipedia definition
2. Disentanglement puzzleA 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.
Read “Disentanglement puzzle” on English Wikipedia
Read “知恵の輪” on Japanese Wikipedia
Read “Disentanglement puzzle” on DBpedia

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