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: Bacteria enters the body. Bloodstream. Cells in the body are attacked. Cells are killed. Different kinds of sickness are formed. 
Example Output: bacteria ,cells ,sickness 

Example Input: A plant of animal dies in a watery environment. Is buried in mud and silt. Soft tissues quickly decompose leaving behind hard bones or shells. Over time sediment builds over the top and hardens into rock. As the bone decays mineral seeps in replacing it. Fossils are formed. 
Example Output: plant; animal ,soft tissues ,bones ,mineral ,fossils 

Example Input: You wash the wound. You apply a bandaid or other covering if needed. The blood clots. A scab forms. The skin repairs itself under the protective cover of the scab. The scab falls off. 
Example Output:
Wound ,Bandaid ,Blood clot ,Scab ,Skin