Instruct: Classify Amazon reviews into positive or negative sentiment
Query: check the edition

The books arrived in a timely manner, however I purchased the 7th edition and received the 6th edition. While I was not happy with this and it has greatly increased my study time, I did not have time to send them back. I paid five times as much as I would have for the 6th edition (finding it for just $10 on amazon). I did not even realize I had the wrong edition until I started questioning why all my assigned readings were on the wrong pages, to late to return it. The books were in good condition I would just recommend checking the edition as soon as you receive them.