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: the emission of sulfur dioxide causes acid rain.
Output: 


Output:
acid rain causes.
acid rain fish.
acid rain forest.
acid rain hurts buildings.
acid rain weathering.
acid rain.
combustion of oil and coal sulfur dioxide.
emission sulfur dioxide.
emits sulfur dioxide.
sulfur dioxide smells like.
sulfur dioxide.