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geometry - Old 6-piece wooden cross puzzle - Puzzling Stack Exchange

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Vtg Yamato Block Puzzle Wood Wooden with Instruction Sheet, made

Help me solve this Yamato/Ultimate wooden block puzzle - Puzzling

The puzzle comprises 6 non-identical, interlocking wooden pieces, similar to those you might find in a Burr.

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Yamato Block - Brass 6 Piece Burr Puzzle

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