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- (define (prueba atom lis)
- (cond
- [(null? lis)
- ()]
- [(eq? atom (car lis))
- (cons (car lis) (prueba atom (cdr lis)))]
- [else (prueba atom (cdr lis))]))
- (prueba 'a '(d a b a))
- (prueba 'a '(a b a))
- (cons 'a (prueba 'a (b a)))
- (cons 'a (prueba 'a (a)))
- (cons 'a (cons 'a (prueba 'a ())))
- (cons 'a (cons 'a ()))
- (cons 'a (a))
- '(a a)
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