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 The names of specific people have been replaced by generic words (e.g., PersonX, PersonY, PersonZ).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 is a part, portion, or makeup of 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: course<sep>Tail: course session

Output: Yes


Input: Consider Input: Head: PersonX asks PersonX's boyfriend<sep>Tail: to await PersonX's response

Output: No


Input: Consider Input: Head: sperm<sep>Tail: acrosome


Output: Yes