SET-OF : UTILITY

SET-OF is an utility.
(SET-OF var list form1 ... formn)
will take list and build a new list, in which every element which does not
satisfy form1 ... formn will be deleted. E. g.
(SET-OF X '(0 1 -1 2 1 -2) (> X 0)) -> (0 1 2 1)

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