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![European abacus counting frame. Calculating... - Stock Illustration [63355071] - PIXTA](https://en.pimg.jp/063/355/071/1/63355071.jpg "European abacus counting frame. Calculating... - Stock Illustration [63355071] - PIXTA")
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ABACUS
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Abacus - RightLobeMath.com
Abacus - RightLobeMath.com
The Abacus: The World's First Computing System: Where it Comes From, How it Works, and How to Use… - Harvard Book Store
What is an Abacus?
ABACUS
