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.
Input: There have been no arrests in any of the slayings.  I have n't (seen) a pattern yet,  said Patricia Hurt, the Essex County prosecutor, who created the task force on Tuesday.  
 Verb: seen
Output:
Yes