LispForum

Hi, i stuck on a problem, a kind of special flatten function : i want to input: '((a b c d e)((f g h)(i j k))(l m n o))) and output: => '((a b c d e) (f g h)(i j k)(l m n o)) i can't find the solution for this problem and don't know lisp function who can do that.. could you help me please ? thanks stf