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(define (fact n)
(if (= n 0)
1
(* n (fact (- n 1)))))
(define (fact/cps n cont)
(if (= n 0)
(cont 1)
(fact/cps (- n 1) (lambda (a) (cont (* n a))))))
(define num 11)
(display (string-append "fact: " (number->string (fact num))))
(display (string-append "fact/cps: " (number->string (fact/cps num (lambda (x) x)))))
(define return #f)
(display (+ 1 (call/cc
(lambda (cont)
(set! return cont)
1))))
(display (return 23))
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