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: magnetism can cause objects to repel each other.
Output: 


Output:
electricity causes magnet fields.
maglev train repel.
magnet repel.
magnetism faraday michael.
magnetism objects.
magnetism repel object.
magnetism.
objects material thing.
objects metal.
repel push away.
repelled objects are opposite.
what cause magnetism.