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Merge.
Wed, 03 Apr 2013 23:05:43 -0400, by Steve Losh
typo
Sun, 23 Dec 2012 22:21:59 -0800, by Richard Ramsden
Merge.
Wed, 03 Apr 2013 23:04:29 -0400, by Steve Losh
Update chapters/23.markdown
Wed, 23 Jan 2013 23:09:51 +0100, by Martin Lundberg

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