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Jost Boekemeier writes: > (define a 1) > (define (l) (display a)) > (l) -> 1 > > (undefine a) > (l) -> #<undefined> > > > I think it is better to let `undefine' remove the symbol completely instead > of setting its value to undefined. what do you mean by "remove completely"? in the above example, `l' is already defined, and its symbol `a' exists for it. how can you make `l' forget about `a'? thi