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: a pulley is used for lifting objects.
Example Output: how to make a pulley.

Example Input: Fact: water vapor cooling causes that water vapor to condense.
Example Output: fogged mirror condensation.

Example Input: Fact: Polyps usually reproduce asexually.
Example Output:
Coral polyp.