Definition: In this task, you are given a paragraph, and your job is to generate comma-separated entities present in the given paragraph. Generate entities from a given passage in such a way that (i) they are present in the paragraph, (ii) they are non-duplicate, (iii) they underwent a state change during the process. Avoid creating entities that (i) aren't present in the process paragraph and (ii) aren't significant. 
Input: Add water to a pot. Put the pot over a source of heat. Turn the heat on. Wait for a few minutes. Begin to observe small bubbles in the water. Wait until the water starts to bubble a lot. Wait until you can see steam rising from the water. Turn the heat source off. Take the pot off of the heat source. 
Output:
water ,pot ,steam ,heat ,small bubbles ,boiling water 