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: Birds have relatively large brains and a high level of intelligence.
Example Output: Bird type.

Example Input: Fact: Aging occurs as cells lose their ability to divide.
Example Output: Dividing cells.

Example Input: Fact: electricity sometimes is used for heating buildings.
Example Output:
create electricity.