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Update chapters/23.markdown
2013-01-23, by Martin Lundberg
Merge.
2013-04-04, by Steve Losh
Update 43.markdown
2013-03-07, by Bill Turner
ack
2013-04-04, by Steve Losh
Proof 52-56.
2013-04-04, by Steve Losh
Proof 49-51.
2013-04-04, by Steve Losh
Proof 42-48.
2013-04-04, by Steve Losh
Proof 38-41.
2013-04-04, by Steve Losh

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