think_complexity: revision graph

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Follow up to last commit. Re-orient the r-pentomino. Added progress display.default tip 2013-07-31, by Brian Neal
Chapter 7, exercise 2. R-Pentomino game of life.2013-07-25, by Brian Neal
Forgot to add these. Needed for Chapter 6.2013-07-25, by Brian Neal
Chapter 6, exercise 4, part 4. A Turing Machine drawer.2013-01-19, by Brian Neal

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