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A comment on Why are Soviet math textbooks so hardcore in comparison to US textbooks? (2017). Parent comment

Re:Why are Soviet math textbooks so hardcore in comparison t... by TimonKnigge on Wednesday April 22, 2020 @03:56AM (#22943253)
Works for 9 as well (or any b such that 10 mod b = 1 .. so 3 and 9).
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