When using the various versions of for like for/list; I often encounter situations where the body must not add any value to put into the generated list (useful when one needs to filter and map simultaneously) or must generate more than value. I guess the way to do this would be to treat the result of the body as a list of additions and then concatenate all these lists. Something similar would be needed for for for/hash(taking care of the multiple values issue),for/and, for/vector etc. I just wanted to know, because this seems like a common enough situation, if there are some standard commands or libraries which implement the modified versions of these commands. thanks, Harsha
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