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.

Input: Consider Input: Fact: adding salt to a solid decreases the freezing point of that solid.

Output: adding salt solid freezing.


Input: Consider Input: Fact: Ejaculation occurs when muscle contractions propel sperm from the epididymes.

Output: ejaculation semen.


Input: Consider Input: Fact: competition may cause animals to fight towards members of their own species.


Output: competition animals food.