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. 

Example Input: Magma rises through surrounding rock. Gas bubbles form and expand, causing lots of pressure. This pressure pushes the magma through weak spots in the earth's surface,. Magma flows out as lava. This can happen slowly or in a huge explosion. 
Example Output: magma ,gas bubbles ,pressure ,lava 

Example Input: You inhale air through your nose and mouth. The air travels down into your lungs. Oxygen from the air goes into your bloodstream. Oxygen circulates throughout the body due to the heart's pumping. Carbon dioxide travels from the blood into the lungs. Carbon dioxide travels from the lungs up the windpipe. Carbon dioxide is exhaled. 
Example Output: air ,oxygen ,carbon dioxide 

Example Input: One type of air pollution is the addition of carbon dioxide gas into the air. Some scientists believe that releasing too much carbon dioxide into the atmosphere is one of the causes of global warming. This upsets the balance of the carbon cycle. The ozone layer helps protect us from harmful rays from the sun. It is getting damaged from air pollution such as methane gas from livestock and CFCs from spray cans. Acid rain is created when gasses such as sulfur dioxide get high into the atmosphere. The wind can blow these gasses for miles and then they get washed out of the air when it rains. This rain is called acid rain and can damage forests and kill fish. 
Example Output:
ozone layer ,acid rain ,forests ,fish