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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)))))

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Which procedure can be used to check whether its argument is a procedure?
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