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: Some pelycosaurs gave rise to a group of animals called therapsids.

Output: pelycosaurs.


Input: Consider Input: Fact: a toaster converts electrical energy into heat energy for toasting.

Output: bread toast.


Input: Consider Input: Fact: gravity causes objects that have mass to be pulled down on a planet.


Output: gravity mass objects weight.