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Amazon.com: Abacus Soroban 17 Digits Rods Chinese Japanese Abacus Calculator Educational Tools Abacus Counting Tool for Adults, Kids : Toys & Games
Japanese Abacus For Kids: A step-by-step guide to addition and subtraction using the Japanese abacus (Soroban).: Green, Mr Paul: 9781532851315: Amazon.com: Books
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