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  1.  
  2. ; MIPT, task # 009
  3. ; "Fibonacci numbers"
  4. ; 13.09.2011
  5.  
  6. (define (fib n)
  7. (define (fib-iter i a b)
  8. (if (= i n)
  9. a
  10. (fib-iter (1+ i) b (+ a b))))
  11. (fib-iter 0 1 1))
  12.  
  13. (display (fib (read)))
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