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.
Q: NAIROBI, Kenya ( AP ) _ U.S. Secretary of State Madeleine Albright paid tribute Tuesday to bombing victims and embassy staffers on a whirlwind visit to East Africa, and promised to (track) down the perpetrators.  
 Verb: track
A:
No