Definition: 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 The names of specific people have been replaced by generic words (e.g., PersonX, PersonY, PersonZ).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 includes an event or an action in the Tail or not. This happens when the Tail denotes a step within the larger head event. 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.

Positive Example 1 -
Input: Head: have conversation<sep>Tail: choose subject to discuss
Output: Yes

Positive Example 2 -
Input: Head: PersonX allergic to bees<sep>Tail: none
Output: No

Negative Example 1 -
Input: Head: PersonX asks to go home<sep>Tail: to go rest
Output: Yes

Negative Example 2 -
Input: Head: communicate<sep>Tail: gather thoughts
Output: No

Now complete the following example -
Input: Head: change society<sep>Tail: start revolution
Output: 

Yes