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The Chinese Abacus, History, How to Use the Chinese Abacus
Suanpan - Wikipedia
How To Use A Chinese Abacus - Sciencing
Chinese Abacus: The beads that changed the world - CGTN
The Story of the Chinese Abacus - China Daily
The Chinese Abacus Explained: Counting, Multiplication & More
Chinese Abacus (Suan Pan) - Alcula
The Chinese Abacus and How to Use it - China Market Advisor
Abacus (Difficult to trace) - In the Chinese history