instruction:
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 The names of specific people have been replaced by generic words (e.g., PersonX, PersonY, PersonZ).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.
question:
Head: PersonX takes medicine in the future<sep>Tail: PersonX buys medicine
answer:
Yes


question:
Head: PersonX accidentally fell<sep>Tail: PersonX trips on the stairs
answer:
Yes


question:
Head: PersonX descends upon PersonY<sep>Tail: PersonX stalks PersonY expertly in the dark alley
answer:

Yes