Instruct: Classify Amazon reviews into positive or negative sentiment
Query: How to write letters for all occasions(yes we still need to write)

I have used the suggestions in this book many times, there are suggestions for almost every occasion and reason. Even though in this day an age we don't think about writing letters(let's make a phone call,etc.) letters are still very effective and writing an appropriate letter never goes out of style, ie: late credit payments, invitations, thank you, letters of sympathy, etc. This is still a very helpful book.