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 The names of specific people have been replaced by generic words (e.g., PersonX, PersonY, PersonZ).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

Example Input: Head: PersonX accepts PersonY invitation<sep>Tail: buys gift
Example Output: No

Example Input: Head: lack of sleep<sep>Tail: have short fuse
Example Output: Yes

Example Input: Head: PersonX accepts PersonY invitation<sep>Tail: happy invitation was accepted
Example Output:
No