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

[Q]: As a student of jiujitsu i understood alot of the moves but i found that without previous knowledge these pictures and instructions were difficult to understand. I feel there is alot of good information but not worth buying.
[A]: Negative


[Q]: This video is fine for ballroom dancers, but it has nothing to do with the authentic Argentine Tango. Even ballroom dancing has now a separate category for Argentine Tango. Unfortunately, this video is not that. That's why, I rate it at 1.
[A]: Negative


[Q]: I have read this book several times since it was first published and find it enjoyable each time I read it. The chacarters he builds in this book are great. It's a book to read when you wish to lay back and dream about how good "US" humans are .......and how fanatical some of "US" can be. If you enjoy Mr. Hogans books you will greatly enjoy this good story. I have read all of Mr. Hogan's books and enjoy them all. I can't wait to see where his next story will take me.
[A]:
Positive