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Polyform Puzzles - world's largest collection of hands-on sets, made by Kadon Enterprises, Inc., since 1980; intro page to 'gamepuzzles for the joy of ...
polyarcs  polydiamonds  polyrhombs  polyrombiks  polyrounds  Poly-Spidrons 
www.polyformpuzzles.com - 2009-04-04
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roger penrose
puzzles
human
math manipulatives
information
collectibles
management
design
pentacubes
martin gardner
games
gamepuzzles
research
pentominoes
resource
hexominoes
kate jones
kadon enterprises inc.
gifts
brain teasers
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