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What is this function supposed to do when given more than 2 arguments, and if so, why?
That is to say, do all the characters have to be not equal, or just any 2 of them?

I can envision a game program that says, "Type 6 different characters to ...", and
then uses this function to barf at you, but short of that, it seems pretty fraudulent.

BTW, please put me on the common-lisp@su-ai mailing list, thanks.