clisp - Lisp: to perform set union operation -

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i 'am beginner in lisp.i use clisp in ubuntu.i have code here in lisp carry out union operation on 2 lists.the logic correct.but stuck @ error is:

*** - append: proper list must not end t

my code is:

(defun set-union (l1 l2) (cond   ((null l2)   ;if l2 null union l1 itself.    l1)   ((not (member (first l2) l1))  ;check if first member of l2 in l1 or not   (setq l1 (append (set-union l1 (rest l2)) (list (first l2))))) ;if not append union of l1 , rest of l2.  (t   (set-union l1 (rest l2)))   )) ;if second condition not true carry out union on l1 , rest of elements of l2 (setq l1 (list 'a 'c 'b 'g)) (setq l2 (list 'd 'g 't)) (set-union l1 l2) (print l1)

i need help!!thanks.

(append (set-union l1 (rest l2)) (first l2))

at point of logic tries append (a c b g . t) , e, fails because first not proper list.

either use

(append (set-union l1 (rest l2)) (list (first l2)))

or, better

(cons (first l2) (set-union l1 (rest l2)))

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