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Verify your copy of the book
Answer one question from your copy of Think Clearly. Verified owners get the book-owner price on full access.
The question names a chapter and a section heading, not a page number, so it works with the paperback and the Kindle edition. Answers ignore capital letters and punctuation. The verification is saved on this browser for about a year, and on your account if you are signed in or sign in afterwards.
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The 20-question diagnostic is free for everyone. Think Clearly is coming soon on Amazon; get one email when it is out.