Sunday, June 7, 2009

Ex-2.66

(define (look-up given-key set)
(cond
((null? set) #f)
((= given-key (key (car set))) #t)
((< given-key (key (car set)))
(look-up given-key (left-branch set)))
((> given-key (key (car set)))
(look-up given-key (right-branch set)))))

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