old abacus on wooden background
Schlüsselwörter
abacus,
counting,
education,
children,
toy,
school,
count,
mathematic,
calculating machine,
mathematic,
learning,
business,
wooden,
wood,
colourful,
finance,
red,
yellow,
bead,
colours,
number,
tool,
bead,
calculating,
green
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