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RE: your mail

> 	These questions sound a lot like homework questions; given that
> I
> can't verify the source of the hotmail.com address, I have no idea
> whether
> the individual behind it is a Scheme user with a serious question, or
> a
> student looking for someone to do their homework.

Which is why I suggested using `unfold'.  If the student/user
understands how to do it that way, he/she will have learned a lot!

-- Paul