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Might I point out that it's spelled "powerful"? I'm not trying to be a spelling cop here, but a misspelling in the title of an advertisement for a book tends to make a bad first impression of the author's writing skills (also, putting a thumbs-up icon on your own post is kinda tacky).
You've left out a very, very important piece of information: where to buy the book. The best marketing campaign in the world won't do any good if people can't buy what you're selling.
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