Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.

[EX Q]: I was extremely disappointed with the fabric and color when it came. It is obvious that it is of poor quality but I guess you get what you paid for 10 bucks.The zipper of the plastic cover of one set was broken.I bought 2 queen sheets and I wanted to return both purchases if only I did not have to pay for shipping.Do not buy this!!!! You will regret it.
[EX A]: Negative

[EX Q]: It's pretty nice and comes with a little book with interesting proverbs too. I'm not sure if it really helps to relieve stress but it's makes a fun distraction once in a while. The only complaint is when other people play around with it, they always spill sand out the box..
[EX A]: Positive

[EX Q]: The content does not simulate the actual USMLE and there are so many nagatively phrased questions and also, most of the questions are never asked as for as my step1 experience goes.
[EX A]:
Negative