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.

Ex Input:
Fact: crumple means change shape from smooth into compacted by physical force.

Ex Output:
compacted density.


Ex Input:
Fact: microscope is used to see small things by biologists by making them appear bigger.

Ex Output:
bacteria small.


Ex Input:
Fact: heat and pressure change the remains of prehistoric living things into natural gas.

Ex Output:

dinosaurs prehistoric.