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: Adult sponges are sessile.
Example Output: sessile immobile.

Example Input: Fact: riding a bike does not cause pollution.
Example Output: bicycle pollution.

Example Input: Fact: if heat is conducted to an object then that object will become hot.
Example Output:
conducted heat.