File: ack.scm

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ruby3.1 3.1.2-7%2Bdeb12u1
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(define (ack m n)
  (cond ((zero? m) (+ n 1))
	((zero? n) (ack (- m 1) 1))
	(else      (ack (- m 1) (ack m (- n 1))))))

(ack 3 9)