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Four Fit - Tray-packing puzzle by Stewart Coffin (STC #217) by asiegel - Thingiverse
Amazon.com: Martins Menace Puzzle A Stewart Coffin Design 217 Shockingly Difficult Brain Teaser: Handmade
Four Fit - Tray-packing puzzle by Stewart Coffin (STC #217) by asiegel - Thingiverse
Puzzle Booklet - Four Fit | Packing Puzzles | Puzzle Master Inc
