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test added by Nikola on Thu Jul 29 02:02:23 2021
(define (fib n)
(let loop ((n1 0) (a 1) (b 1) (t 1))
(if (= n1 n)
a
(loop (+ n 1) b (+ a b)))))
(define (fib n)
(let loop ((n1 0) (a 1) (b 1) (t 1))
(if (= n1 n)
a
(loop (+ n 1) b (+ a b)))))