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RosettaCodeData/Task/Mutual-recursion/Common-Lisp/mutual-recursion.lisp

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Common Lisp
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(defun m (n)
(if (zerop n)
0
(- n (f (m (- n 1))))))
(defun f (n)
(if (zerop n)
1
(- n (m (f (- n 1))))))
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