Determine the prime factors of a given positive integer (2)

	;; P36 (**) Determine the prime factors of a given positive integer (2).
	;; Construct a list containing the prime factors and their multiplicity.
	;; Example:
	;; * (prime-factors-mult 315)
	;; ((3 2) (5 1) (7 1))
	;; Hint: The problem is similar to problem P13.
	#lang racket
	(provide prime-factors-mult)
	(require "p10.ss")
	(require "p35.ss")
	(define (prime-factors-mult n)
	(map reverse (encode (prime-factors n))))

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