Generate a random permutation of the elements of a list

	;; P25 (*) Generate a random permutation of the elements of a list.
	;; Example:
	;; * (rnd-permu '(a b c d e f))
	;; (B A D C E F)
	;; Hint: Use the solution of problem P23.
	(require "p23.ss")
	(define (rnd-permu lst)
	(rnd-select lst (length lst)))

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