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It usually is made of a set of requested beads that could be moved and positioned to signify figures. In some cases the beads are aligned horizontally, for instance while in the Russian abacus, or vertically, as from the Chinese and Japanese abaci. Slideshare works by using cookies to enhance http://dominickyncpc.link4blogs.com/16188142/rumored-buzz-on-online-abacus-class


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