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File:Six-Piece Burr - Nut Puzzle.svg - Wikimedia Commons
Simple 6-Piece 6-Solutions Burr Set" - Copyright J. A. Storer
Burr Puzzle
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Six-Piece Burr
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Simple 6-Piece 6-Solutions Burr Set" - Copyright J. A. Storer
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How to Make a 6 Piece Burr Puzzle with Hand Tools - YouTube
