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

[Q]: This book was brand new when I received it. However, it did not arrive for 20 days after I ordered it.
[A]: Negative

[Q]: It does an excellent job on mildewed wood such as decks and deck furniture without using chemical mode which is the only weak link in an otherwise strong chain. Unfortunately, the only effective chemical solution is chlorine which acts more or less on its own but cannot be used with this machine. Safe cleaners, such as Simple Green are no more effective than when used without them. Other than that, it's a great product.
[A]: Positive

[Q]: This was a fascinating look at mental illness. I could really feel her pain and understand how easy it would be to slip into this state.
[A]:
Positive