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 The names of specific people have been replaced by generic words (e.g., PersonX, PersonY, PersonZ).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 opens all of PersonY's presents<sep>Tail: PersonX leaves when PersonY gets mad

Output: Yes


Input: Consider Input: Head: PersonX makes an appointment<sep>Tail: PersonX has to reschedule it because something comes up that day

Output: Yes


Input: Consider Input: Head: PersonX works within the system<sep>Tail: PersonX serves on several committees


Output: Yes