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.
One example is below.
Q: Only the government of the United States can decide if it prefers this variant, continued the letter, which Castro read on a state television station broadcast. Gonzalez for months refused requests by Elian's Miami relatives to go to the United States to (claim) the boy.  
 Verb: claim
A: Yes
Rationale: This is a good example. Gonzalez refused to "claim" the boy. So, the claim didn't happen and it's a negation.
Q: Ultimately, we would need to have a hair taken directly from Kopp himself to establish conclusively the hair from scene is his,  the official added. The official said the hair was in a cap that authorities found very near the location from which the sniper is thought to have fired the rifle bullet that (killed) Slepian as he stood in the kitchen of his home in the Buffalo suburb of Amherst, N.Y.  
 Verb: killed
A:
No