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: Hagfish are noted for secreting large amounts of thick, slimy mucus.
Example Output: hagfish ancient.

Example Input: Fact: if an object reflects light toward the eye then that object can be seen.
Example Output: light beams.

Example Input: Fact: refracting sunlight causes sunlight to split into different colors.
Example Output:
prism refraction.