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Dec 11th, 2017
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  1. (defun longueur (x liste)
  2. (cond
  3. ((atom liste) nil)
  4. ((and (listp (car liste)) (equal (length (car liste)) x)))
  5. (cons (car liste) (longueur x (cdr liste)))
  6. ((longueur x (cdr liste)) ) )
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