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RE: Lists composed of equal number and kind of elements

From: Drew Adams
Subject: RE: Lists composed of equal number and kind of elements
Date: Mon, 27 Jul 2015 18:07:43 -0700 (PDT) 
>     (defun set-equal (list-1 list-2)
>       (and (null (cl-set-exclusive-or list-1 list-2))
>            (= (length list-1)
>               (length list-2)) ))

All you need to test is (cl-set-exclusive-or list-1 list-2).

(a a a b b), (b b a), and (b a) all represent the same set.

IOW, neither order nor duplication matters.
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