CS257 POP QUIZ NUMBER ONE        name: Barak Pearlmutter
			     SPRING 1999               CIRT userid: barak

What do each of the following return (ie how does Scheme respond when
you type each of these at its prompt)?

 (or 3 99)         ;Answer: 3


 (and 3 99)        ;Answer: 99



Rewrite the following to remove the AND and the OR, and instead use
COND and/or IF.

(define lady?
  (lambda (x)
    (and (not (once? x))
	 (or (twice? x)
	     (three-times? x)))))

;;;ANSWER:

(define lady?
  (lambda (x)
    (cond ((once? x) #f)
	  ((twice? x) #t)
	  (else (three-times? x)))))