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 Q]: They take in fluids and liquids. They process the fluid. They take out the toxins. Produce urine. Urine is released. The nutrients are returned to the body. 
[EX A]: fluids and liquids ; fluid ; nutrients ,toxins ,urine 

[EX Q]: Something happens to produce a sound. The sound travels in waves. The sound waves hit an object. The object absorbs some of the sound waves. Some of the sound waves bounce off of the object. The reflected sound waves can be heard, though they have slightly different properties than the original sound. The sound continues to bounce off of things and produce echoes until it is totally absorbed or dissipated. 
[EX A]: sound ; sound waves ,echoes 

[EX Q]: One goes to a wilderness area. One sets up a tent. One puts their clothes, sleeping bag, etc. into the tent. One gathers firewood. One builds a fire for warmth, cooking, etc. 
[EX A]:
tent ,clothes ,sleeping bag ,firewood ,fire 

