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Update chapters/23.markdown
Wed, 23 Jan 2013 23:09:51 +0100, by Martin Lundberg
Merge.
Wed, 03 Apr 2013 23:01:09 -0400, by Steve Losh
Update 43.markdown
Wed, 06 Mar 2013 23:44:40 -0500, by Bill Turner
ack
Wed, 03 Apr 2013 23:00:48 -0400, by Steve Losh
Proof 52-56.
Wed, 03 Apr 2013 22:49:39 -0400, by Steve Losh
Proof 49-51.
Wed, 03 Apr 2013 22:37:59 -0400, by Steve Losh

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