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 The names of specific people have been replaced by generic words (e.g., PersonX, PersonY, PersonZ).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.

Ex Input:
Head: PersonX walks one day<sep>Tail: PersonX gets hit by a car

Ex Output:
Yes


Ex Input:
Head: PersonX throws PersonX's food into the scale<sep>Tail: PersonX measured enough food to eat

Ex Output:
Yes


Ex Input:
Head: PersonX uses PersonY example<sep>Tail: PersonX gets rewarded for it

Ex Output:

Yes