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(define count 0)
(let ((x (an-element-of '(a b c)))
(y (an-element-of '(a b c))))
(permanent-set! count (+ count 1))
(require (not (eq? x y)))
(list x y count))
(a b 2)
(a c 3)
(a b 1)
(a c 1)
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