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{} added by C-Keen on Fri Apr 10 11:00:47 2015

(define inline-wiki-link
  (c-enclosed-by (c-char-seq "{")
               (->> (c-none-of* (c-is #\}) c-item)
                    (c-one-or-more)
                    (node 'wiki-link))
               (c-char-seq "}")))

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What's the procedure to access a character in a string by index in R5RS?
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