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: crumple means change shape from smooth into compacted by physical force.
Example Output: compacted density.

Example Input: Fact: sandpaper is used to smooth wooden objects.
Example Output: Wooden object.

Example Input: Fact: Cartilage is a tough tissue that contains a protein called collagen.
Example Output:
cartilage shark.