education concept abacus with many colorful beads details the mathematical exercises |
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| navigate by keyword : abacus accounting arithmetic background bead beads black blue business calculation calculator colorful concept count details education exercises finance green home learning many math mathematical mathematics number object old program red retro school subtraction tool traditional wood wooden yellow |
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| Education concept - abacus with many colorful beads. details on the abacus. Mathematical exercises. School program |
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