Instruct: Classify the given review into positive or negative sentiment.
Query: Not error free

As an instructor using this book, the sheer number of errors, both in the student version and the instructors book, are beyond words. It appears as if there was no proofreading at all. If you are a student and being told you have to use this book - beware! Instructors should not require this book at all and if you have, demand a refund.