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no title added by anonymous on Mon May 28 07:47:51 2018

(define (range n m #!optional (k 1))
  (let loop ((i n)
             (acc '()))
    (unless (>= i m))
        (cons i acc)
        (loop (+ i k) acc)))
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What's the procedure to access a character in a string by index in R5RS?
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