Thanks for the reply, Agermain. I don't think this solution would be as clean as ant's "a/an/ant", though. I don't have any way of predicting how much traffic this is goign to get, so maybe one directory a month is plenty, maybe one a day is better. I don't want to have to adjust the algorithm after the fact depending on traffic.

I think your idea works better than my original one, though, since that would end up with 26^3 subdirectories! (doh)
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man with no legs, inc.