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This is all the code associated with the text--the book is built with bookdown.
Spot a typo, or have a suggestion? Feel free to post an issue here. You may also submit pull requests through Github. I'll be happy to take a look.
The textbook is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. The code used to generate the text is licensed under a Creative Commons Zero v1.0 Universal license.