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>is there another way to split a list than to use list-head and >list-tail? > >I would like to avoid running twice through the list to the point where >the list should be splitted. I don't know of a primitive to do this. The funny thing about interpreters is that you're probably better off scanning the list twice in primitives than once in interpreted code. Unless you're sure it's a problem, I'd just write the obvious code and be done with it.