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factorial pasted by anonymous on Thu Apr 11 04:46:25 2013

(define (factorial x)
    (if (= x 1) 1
        (* x (factorial (- x 1)))
    )
)
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don't forget 0! added by zbigniew the anonymous on Thu Apr 11 05:02:35 2013

(define (factorial x)
  (if (= x 0)
      1
      (* x (factorial (- x 1)))))
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