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Mark and David are also both happy to answer book questions from readers, though you're more likely to get a response by sending "Core Language" questions to Mark, and "Outer Layer" queries to David, the two area's respective primary authors. You can find both of the authors' email addresses at the book's web site.

(Throughout this book, we normally use "we" to refer to both authors, but occasionally slip into a specific author's name for personal anecdotes—usually Mark in the Core Language parts, and David in the Outer Layers parts, reflecting the primary author of each part. Although this book was a joint effort of many, each author sometimes steps out of the collective.)