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並前往https://www.quora.com/How-do-I-write-a-zero-so-it-is-different-from-the-letter-o-when-handwriting-specifically-in-maths-as-it-can-be-really-confusing

How to write a zero so it is different from the letter o ... - Quora

I would say that in math, there are more numbers than letters, so make the number zero just '0'. And don't ever call an index variable 'o' - as in o = o + 1.

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