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.

Q: The ceremony was held at Andrews Air Force Base, near Washington, where 10 of 12 American victims of the Kenya embassy bombing were brought back by Secretary of State Madeleine Albright. Clinton said the United States will not (retreat) from the world because of terrorist attacks.
Verb: retreat

A: Yes
****
Q: In the air, U.S. Air Force fliers say they have engaged in a little cat and mouse with Iraqi warplanes, which have retreated when weapons radar locks onto them. They do n't (want) to play with us, one U.S. crew chief said.
Verb: want

A: Yes
****
Q: But under new terms of the agreement, announced Friday, LIN holders would receive a special cash dividend of $42 a share, representing a payout of about $2.23 billion, shortly before the proposed merger. LIN said it expects to borrow the money to pay the dividend, but commitments from banks still have n't been (obtained).
Verb: obtained

A:
Yes
****