Instruct: Classify the given review into positive or negative sentiment.
Query: Abbreviations you MUST know beforehand!

If you already know the abbreviation you need, this book is ok. If you need to know an abbreviation you are NOT going to like this book. For instance, need to know how to abbreviation mercury? If you don't know it starts with H...good luck. No index in the back listing mercury...page etc etc. Would have been nice.