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: evaporation can be used for separating a solute from a solvent in a solution.
Output: 


Output:
a solvent.
evaporation boil.
evaporation solvent.
evaporation.
heat causes evaporation.
salt evaporation.
salt is a solute.
separating apart.
separation is segregation.
solute solvent.
solvent water solute.
solvent.