Learning the soroban rapid mental calculation as an adult - https://github.com/whacked/cow/blob/main/learning%20the%20soroban%20as%20an%20adult.md#hackernews
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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
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