(define (make-rat n d)
(let ((g (gcd n d)))
(cons (/ (*
(abs n)
(if (xnor (> n 0)
(> d 0))
1
-1))
g)
(/ (abs d) g))))
KGRlZmluZSAobWFrZS1yYXQgbiBkKQogIChsZXQgKChnIChnY2QgbiBkKSkpCiAgICAoY29ucyAoLyAoKgogICAgICAoYWJzIG4pCiAgICAgIChpZiAoeG5vciAoPiBuIDApCiAgICAgICAgICAgICAgICAoPiBkIDApKQogICAgICAgICAgMQogICAgICAgICAgLTEpKQogICAgICBnKQogICAgICAgICAgKC8gKGFicyBkKSBnKSkpKQ==