Instruct: Classify a given review into positive or negative sentiment.
Query: What a great book!

I've never had an easier, yet more rigorous, introduction to logic. From the start, the author engages you in interesting explanations which are very clear. The Logicola software is great as well, which without, I would not have understood the material as good as I do now. It's only been 4 days and I'm already on chapter 4, having done EVERY problem in the book so far and many on the software! For self study, there is no better.