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. 

Ex Input:
The coal is placed in a heater. The coal is super heated. The heat is connected to a boiler. The boiler is full of water. The heat turns the water into steam. The steam turns a generator. The generator produces the electricity. 

Ex Output:
coal ,heat ,water ,steam ,generator ,electricity 


Ex Input:
Warm, moist air moves from south to north. Cool, dry air moves from north to south. The air masses meet. The conditions that form are not stable because the air masses are so different. Winds are directed in a certain way because of how the masses interact. An updraft results. Winds start to form circular patterns in the updraft. A tornado can result. 

Ex Output:
warm, moist air ,cool, dry air ,air masses ; masses ,wind ,updraft ,circular patterns ,tornado 


Ex Input:
The oil is extracted either onshore or offshore by large oil rigs. Crude oil is transported to a refinery. The refinery turns the crude oil into gasoline. The gasoline is loaded onto tank trucks. The tank trucks go to gas stations all over the place. The gasoline is delivered to the gas station. 

Ex Output:

oil ,gasoline