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: freezing causes a solid to form.
Example Output: freeze molecules.

Example Input: Fact: a graduated cylinder is used to measure volume of a liquid.
Example Output: a graduated cylinder is used to measure volume of a liquid.

Example Input: Fact: Digestion is the process of breaking down food into components the body can absorb.
Example Output:
Digestion.