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- (define arbre? ; booleen
- (lambda (A) ; une liste
- (or (vide? A)
- (and (= (length A) 3)
- (not (list? (car A)))
- (and (list? (cadr A)) (arbre? (cadr A)))
- (and (list? (caddr A)) (arbre? (caddr A)))))))
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