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 The names of specific people have been replaced by generic words (e.g., PersonX, PersonY, PersonZ).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 keeps PersonY in touch<sep>Tail: PersonX talks to him over facebook to see what he's doing

Output: Yes


Input: Consider Input: Head: PersonX sees PersonX's work<sep>Tail: PersonX copies the work

Output: Yes


Input: Consider Input: Head: PersonX licks PersonY's lips<sep>Tail: PersonX unbuttons PersonY's shirt


Output: Yes