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:
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. 

Ex Output:
air ,oxygen ,carbon dioxide 


Ex Input:
The moon orbits the earth. The earth orbits the sun. The moon comes between the sun and the earth. The sun is totally blocked. A solar eclipse is occurring. 

Ex Output:
earth ,moon ,sun ,solar eclipse 


Ex Input:
You must decide the purpose of the satellite. You must draw up a plan to what kind of orbit the satellite will travel. You make preparations for the rocket that will travel into space. Prepare the crew that will send it there. You begin the countdown date for the rocket. And then you send the rocket carrying the satellite into space. Once in orbit the satellite will be placed where it was planned. 

Ex Output:

satellite ,rocket