Oops! I just wrote:
+---------------
| ...why not have one that's at least efficient and perspicuous
| *and* also incidentally preserves the order of the input values?  ;-}
|     (defun separate (list)
|       (loop for item in list ...
+---------------

My apologies for not reading the *entire* thread tree
before replying, or I would have seen that Rob St. Amant
had beat me with this version by nearly six hours. (*sigh*)


-Rob

-----
Rob Warnock			<rpw3@rpw3.org>
627 26th Avenue			<URL:http://rpw3.org/>
San Mateo, CA 94403		(650)572-2607