idnits 2.17.1 

draft-boutell-png-spec-05.txt:
  Skipping this file; it looks like a tombstone file to me.
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1	This Internet-Draft was published as an Informational RFC, RFC 2083
2	(http://www.ietf.org/rfc/rfc2083.txt), on 1997-01-16.

4	The name of the internet-draft was draft-boutell-png-spec-04.txt