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: plant requires seed dispersal for reproduction.
Example Output: plant reproduce.

Example Input: Fact: keeping food cold is used for keeping food fresh.
Example Output: food cold safety.

Example Input: Fact: friction is used for stopping a vehicle by brakes.
Example Output:
braking cars can fishtail.