Instruct: Classify an Amazon review into positive or negative sentiment.
Query: Almost a bigger waste of time than the main textbook.

It almost seems as if the authors of the book couldn't work their own problems. i have no idea how they choose which problems they do-- they only do the odd-numbered problems, and even not many of those! They don't explain each step, only referring you back to the textbook, which itself is useless and incomprehensible.Don't bother.