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Learning the soroban rapid mental calculation as an adult

https://github.com/whacked/cow/blob/main/learning%20the%20soroban%20as%20an%20adult.md

#HackerNews #Learning #Soroban #Mental #Calculation #Adults #SorobanSkills #RapidCalculation

cow/learning the soroban as an adult.md at main · whacked/cow

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