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parser added by andyjpb on Tue Sep 29 18:00:04 2015

(define boolean
  (lambda (_)
   (fprintf (current-error-port) "HELLO\n")
   (pp (parse fail _) (current-error-port))
   (fprintf (current-error-port) "HELLO\n")
    (s11n4j-abort "boolean not implemented!")))

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Given a list, which one-argument R5RS procedure returns the element at index 0?
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