In this task, you need to write a topic word from the given fact. The topic word must have at least one word overlap with the given fact. The topic word often involves adding a new word from a related concept. In your topic word, use at least one word from the given fact. Topic words with two or more words work best.

Input: Consider Input: Fact: Shivering occurs when many muscles contract a little bit all at once.

Output: Shivering occurs when many muscles contract a little bit all at once.


Input: Consider Input: Fact: a flower 's purpose is to produce seeds.

Output: animals seeds.


Input: Consider Input: Fact: hydropower requires damming a river.


Output: damming river.