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 The names of specific people have been replaced by generic words (e.g., PersonX, PersonY, PersonZ).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

Head: PersonX achieves PersonY understanding<sep>Tail: PersonX gains knowledge.
No

Head: PersonX rides bikes together<sep>Tail: PersonX and PersonY are friends
Yes

Head: PersonX is really sick<sep>Tail: PersonX eats some old food

Yes