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.

Ex Input:
Fact: Immunity results from immunization.

Ex Output:
immunization vaccine.


Ex Input:
Fact: pollutants have a negative impact on the environment.

Ex Output:
environment health.


Ex Input:
Fact: Cells are programmed to divide only a set number of times.

Ex Output:

Cells divide.