LIST related Functions
vle-append vle-cdrassoc vle-member vle-remove-all vle-remove-last vle-search vle-list-split vle-list-intersect vle-list-diff
vle-nth<x> vle-put-nth vle-remove-first vle-remove-nth vle-sublist vle-subst-nth vle-list-union vle-list-massoc vle-list-subtract