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.

Example Input: Fact: satellite technology is used for predicting the weather.
Example Output: predict weather.

Example Input: Fact: Some pelycosaurs gave rise to a group of animals called therapsids.
Example Output: pelycosaurs.

Example Input: Fact: seasons cause change to the environment.
Example Output:
environment animal habitat.