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: Jaws make cartilaginous fish excellent predators.
Example Output: Jaws make cartilaginous fish excellent predators.

Example Input: Fact: Dilation occurs when cell walls relax.
Example Output: Dilation occurs when cell walls relax.

Example Input: Fact: Cells cannot survive without oxygen.
Example Output:
cells blocks.