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Finally, I would be nowhere without Jen Beverly. She read every chapter, kept me going
when I wanted to quit, and let me sleep late after all-night writing sessions. She did
it all while pregnant and, later, while tending to our new son, Evan (who was born
roughly between Chapters 4 and 5). I couldn??™t ask for a better partner.
Acknowledgments
Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii
Chapter 1 What Is Tagging? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
How Tagging Works . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Why Tagging Matters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .


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