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 Wed Jul 31 14:41:36 2013  Akinori MUSHA  <knu@iDaemons.org>
 
 	* lib/set.rb: [DOC] Add a couple of notes on Hash as storage.
+	  ref. [Feature #6589]
 
 Wed Jul 31 14:38:52 2013  Akinori MUSHA  <knu@iDaemons.org>