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Add the skeleton of the rest of the book.
Tue, 16 Oct 2012 19:51:19 -0400, by Steve Losh
External commands chapter.
Sat, 13 Oct 2012 20:21:18 -0400, by Steve Losh
Update final todo list.
Fri, 12 Oct 2012 20:08:27 -0400, by Steve Losh

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