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      Pulleys Pull Their Weight: Simple Machines for Kids by Diehn, Andi
      Pulleys Pull Their Weight: Simple Machines for Kids -- Andi Diehn, Hardcover
      $20.95 $13.99
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      Pulleys Pull Their Weight: Simple Machines for Kids by Diehn, Andi
      Pulleys Pull Their Weight: Simple Machines for Kids -- Andi Diehn, Paperback
      $13.95 $9.99