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in reply to Devine Lu Linvega

I've been enjoying this book a lot.

Takashi Kojima's Advanced Abacus, incidentally it describes something very similar to the Karatsuba algorithm in the alternative multiplication techniques.
in reply to Devine Lu Linvega

an abacus is the natural next-gen upgrade for an old style shop keeper I know, who currently does additions either mentally or using pen and paper. I would like to gift him one, but I'm afraid it's a "faster horse" he won't ride. He sells calculators.

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