This book will be updated in the open, and it wouldn't be nearly as good without your contributions. There are a number of ways you can help make the book even better:
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If there’s a particular section of the book that you think needs an update (or is just plain missing), please let us know by filing an issue.
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Submit a pull request including a brief description of your changes: fixing typos is perfectly adequate.
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If you make significant changes, include the phrase "I assign the copyright of this contribution to Hadley Wickham" - I need this so I can publish the printed book.
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If you don't understand something, please let me know. Your feedback on what is confusing or hard to understand is valuable.