In the past,people used ___ to calculate fast.(abacus)

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In the past,people used ___ to calculate fast.(abacus)
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In the past,people used ___ to calculate fast.(abacus)
In the past,people used ___ to calculate fast.(abacus)

In the past,people used ___ to calculate fast.(abacus)
In the past,people used _abacuses__ to calculate fast.(abacus)