Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Powerful book by Tony. Powerful Techniques.

When Unlimited Power came out in the 1980's, the concepts were new and revolutionary. Few knew anything about NLP (Neuro-Linguistic-Programming).While Tony didn't invent NLP, he did do the most to popularize it. And I am 100% behind Tony with his NAC (neuro-associative-conditioning) As Tony explains, these techniques do offer immediate results but like physical exercise they must be repeated periodically or the effect is lost. I know it happened to me.United Power teaches both conventional mind conditioning in concert with NLP/NAC. The combination is very powerful.Good book by Tony Robbins and easy to see whay it has been a best seller now for nearly 20 years.