Definition: 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.

Positive Example 1 -
Input: Fact: pesticides cause pollution.
Output: pollution harms.

Positive Example 2 -
Input: Fact: pesticides cause pollution.
Output: modern farming pesticide.

Negative Example 1 -
Input: Fact: pesticides cause pollution.
Output: computer harms.

Negative Example 2 -
Input: Fact: pesticides cause pollution.
Output: toopaste helps.

Now complete the following example -
Input: Fact: coal is used to produce electricity by burning in coal-fire power stations.
Output: 


Output:
Electricity is energy.
burn heat up.
coal burn electricity.
coal burning.
coal formed.
coal fossil.
coal global warming.
coal is made from dead animals.
coal-fire stations.
electricity power electronics.
fossil coal.
power stations fire.