(define t '((a . 1)
	    (x . 7)
	    (b . 2)
	    (y . 6)
	    (c . 3)
	    (z . 5)))

(assoc 'a t)
(assoc 'b t)
(assoc 'c t)
(assoc 'w t)

(define t '((a . 1)
	    (x . 7)
	    (b . 2)
	    (y . 6)
	    (c . 3)
	    (z . 5)))

(assoc 'a t)
(assoc 'b t)
(assoc 'c t)
(assoc 'w t)
