Cedric Chang wrote:
> I am going to recommend that you use A-Z  and a-z and 0-9 for your  
> serial number.  This gives you a base 62 digit.  Be sure to use a  
> type style that differentiates between O ( oh ) and 0 (zero ).
>   

I often thought that if I ever devised a serial number scheme, all 
ambiguous characters would be forbidden, e.g.:

o 0 i l 1

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