In this task, you are given two phrases: Head and Tail, separated with <sep>. The Head and the Tail events are short phrases possibly involving participants. The names of specific people have been replaced by generic words (e.g., PersonX, PersonY, PersonZ). PersonX is always the subject of the event. You have to determine whether the Head happens before the Tail or not. Classify your answers into "Yes" and "No". The phrase may also contain "___", a placeholder that can be an object, a person, and/or an action.

Input: Consider Input: Head: PersonX serves PersonX's interests<sep>Tail: PersonX becomes president

Output: Yes


Input: Consider Input: Head: PersonX accidentally stepped<sep>Tail: to walk somewhere else

Output: No


Input: Consider Input: Head: PersonX performs PersonY's task<sep>Tail: PersonX tells PersonY that the task is finished


Output: Yes