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Bradd W. Szonye wrote: > COLLECTION-FOLD-LEFT/RIGHT > > For dictionaries, enumerates the range-domain pairs. In other words, > the "single collection value" accepted by the fold-function should be > a (cons range-value domain-value). Please excuse me for foolishly swapping "range" and "domain." The domain is what you map from, and the range (aka codomain) is what you map to. I haven't done set-theory work in a while, and I got the two turned around. Therefore, dictionaries should be collections of domain-range pairs, with the domain indexed for easy retrieval. -- Bradd W. Szonye http://www.szonye.com/bradd