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Abacus - Wikipedia
I learned how to do math with the ancient abacus — and it changed my life - Vox
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Binzhou, Binzhou, China. 10th May, 2018. Binzhou, CHINA-10th May 2018: A giant abacus made of Siam rosewood can be seen at the Shuiluopo Folk Cultural Park in Binzhou, east China's Shandong Province.
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Abacus - Wikipedia
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