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    • Curtis Kuhn
    • Posted on Mon 15 Nov 2010 05:05 PM

    One thing you might want to keep in mind from a usability standpoint is to keep the letters in lowercase. That way users can more easily distinguish between letters and numbers. They won't be left wondering if something is a 0 (number zero) or an O (letter O). Of course you then might run into confusion with lowercase l and the number 1. Maybe a good idea to eliminate 0s, Os, ls and 1s altogether. It decreases your pool of available codes but would probably lead to less frustration and a higher success rate.

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