Detailed Instructions: You will be given a context and a verb separated with a newline character, and you have to answer if the given verb is a negation or not. A verb is a negation if it is not going to exist, not happen, or has no effect. The output should be "Yes" if the verb is a negation and "No" otherwise.
Problem:But the big, often tumultuous slide in stock prices this month has turned some of those who have been profiting from the practice against it. Peter DaPuzzo, head of retail equity trading at Shearson Lehman Hutton, acknowledges that he was n't (troubled) by program trading when it began in the pre-crash bull market because it added liquidity and people were pleased to see stock prices rising.  
 Verb: troubled
Solution:
Yes