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(let ((set-counter2 #f))
(define (get-counter2)
(call/cc
(lambda (k)
(set! set-counter2 k)
1)))
(define (loop counter1)
(let ((counter2 (get-counter2)))
(set! counter1 (1+ counter1))
(cond ((not (= counter1 counter2))
(error "bad call/cc behaviour" counter1 counter2))
((> counter1 10)
#t)
(else
(set-counter2 (1+ counter2))))))
(loop 0))
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