Instruct: Classify Amazon reviews into positive or negative sentiment
Query: We're still in business because of this book.

If you're thinking about being a consultant, this book is a must read. Someone loaned us a copy of this and got us on the right track nearly 10 years ago. Without it, we would surely have been out of business in a couple years. So let us pass it on again - read this book. Understand the words. And best of luck.