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Thinking on the readings with abacus serves as an example | CCTP 711 – Semiotics and Cognitive Technology
The Abacus: A Brief Introduction
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Abacus' by Paul Rand, ca. 1946
What is Abacus Addition and Subtraction? | Abacus counting
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Abacus - Wikipedia
L'abacus soroban était l'un des outils de calcul avant la calculatrice électrique a été largement utilisé au Japon. Pourtant, le soroban abacus a été un excellent outil éducatif pour les enfants à