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Online abacus class for Dummies

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It usually consists of a set of ordered beads which can be moved and positioned to represent quantities. Occasionally the beads are aligned horizontally, such as within the Russian abacus, or vertically, as from the Chinese and Japanese abaci. The beads within the rod in the much correct signifies those. http://fernandovlana.blogadvize.com/704332/the-basic-principles-of-online-abacus-class

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