Detailed Instructions: Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.
See one example below:
Problem: I've read this book with much expectation, it was very boring all through out the book
Solution: Negative
Explanation: Review writer does not like the book because it was boring, therefore it is a negative review.

Problem: Prof. Jay is a genius. All of the techniques shown in this book works effectively. I use many of them during informal nhb matches and they saved my butt hundreds of times. If only Prof. Jay included some ground-fighting escapes and reversals, then I'll recommend this book to everyone, even to BJJ practitioners.
Solution:
Positive