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#1 2016-02-22 14:25:22

Monox D. I-Fly
Member
Registered: 2015-12-02
Posts: 782

[ASK] Sites About Abacus

Does anybody here know where is the site to learn all about abacus, from its definition, history, types, and levels? I've been searching on Google but only found abacus learning courses which don't even talk about those. Thanks in advance for your help.

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