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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.
+
 Wed Jul 31 14:38:52 2013  Akinori MUSHA  <knu@iDaemons.org>
 
 	* lib/set.rb: [DOC] Fix example result.  Hash is now ordered.