(let-values ((arg (car args)))
    (cond
     ((member arg '("-h" "-H" "-?" "--help" "-help"))
      (rfc-usage))
     ((member arg '("-v" "-V" "--version" "-version"))
      (rfc-version))
     ((member arg '("-n" "-N" "--items" "-items"))
      (rfc-items (cdr args)))
     (else
      (print arg)))))