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: the Himalayas were formed by rock folding.

Output: Himalayas located.


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

Output: environment health.


Input: Consider Input: Fact: Viruses are so small that they can be seen only with an electron microscope.


Output: electron microscope lens.