Instruct: Classify Amazon reviews into positive or negative sentiment
Query: So good I bought it.

Years ago I checked this book out of the library. I bought a copy the day the book was returned to the library. I have used it so much for my research that it is now held together with tape and glue. (I am a published author of short fantasy stories that have as their framework some of the information on village life from this book.) Thanks are due to these fine people for opening up the past to our modern eyes.