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: bacteria in soil convert atmospheric nitrogen into a form usable by plants.
Output: 


Output:
bacteria  atmospheric nitrogen.
bacteria in soil.
bacteria nitrogen plants.
bacteria nitrogen.
bacteria single.
nitrogen plant.
nitrogen plants.
plant flower.
plant orchid.
plants are producers.
plants bamboo.
plants nitrogen.
plants use nitrogen to grow.