Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Comment on the reviews

Reviews written using undefined abbreviations are simply useless to any reader who is unfamiliar with what can be appropriately called jargon. e.g. a few will claim they understand the abbreviation USA represents United States of America but most have started claiming they are far from being United. What about the new borns who have never heard of or never want to know of USA. What the devil is KPX katapillx tell me more you yankee boys.