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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")
European abacus counting frame. Calculating... - Stock Illustration [63355071] - PIXTA
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ABACUS
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Abacus System for Ghanaian basic Schools | Semantic Scholar
