How many small friends formulas are in abacus ?
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For those unaware, Abacus is a manual aid to calculating that consists of beads or disks that can be moved up and down on a series of sticks or strings within a usually wooden frame.
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For those unware there is a aid to calculate .it consists of beads and disks and can be moved up and down on a serious of sticks and strinks within a usually Wooden frame.
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