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

Now, solve this: I purchased this as a replacement for an old roll up tatami mat that I purhased at least twenty years ago. These are perfect for taking to the beach but couldn't find them local now. The tatami is woven tightly so that it keeps the sand off. Saw this and looked like a good idea.These are really three separate tatami mats, each about 11" wide by about 6' in length, joined by a blue canvas strip that runs the full length (top to bottom). It is colorful and handy, folding up in to object about the size of a large book with handles.Problem I ran into was that the strip joining two of the panels ripped apart first time I took it to the beach, rendering it useless for its intended purpose. Perhaps mine was just a bad sample but at $10 a throw, I will be asking for a refund.
Solution:
Negative