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.

He persevered through courage and a belief in the right of his patients to choose whether to bear a child. But a principled commitment to provide a constitutionally protected service could not (stop) the assassin's bullet that tore through his kitchen window and into his back Friday night.  
 Verb: stop
Yes

Tuesday to sign a paper promising to turn over the boy to immigration authorities if they lose their federal court appeal. The Miami relatives thus far have refused to (sign) the document, and in recent days said they would not turn Elian over to his father if he came to the United States.  
 Verb: sign
Yes

NAIROBI, Kenya ( AP ) _ U.S. Ambassador Prudence Bushnell (wrapped) up some unfinished business on Wednesday, meeting with Kenya's trade minister to finish talks that were interrupted by the car bombing of the embassy.  
 Verb: wrapped

No

