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: Water comes through a filter. The filter has small pores to catch pollutants. The filter will catch chlorine, heavy metals, and other chemicals. The filter allows water and mineral ions like fluoride to pass through. The water on the other side of the filter is much cleaner.
Example Output: chorine ,heavy metals ,other chemicals

Example Input: A plant or animal dies in mud or soil. The bones are all that remains. Over time the bones are covered in sediment. The sediment becomes rock. The rock becomes a fossil.
Example Output: plant or animal ,bones ,sediment ,rock ,fossil

Example Input: Someone is infected with bacteria. That bacteria begins to grow and reproduce inside the cells. The dividing bacteria begin to make toxins. Those toxins damage your cells. Disease symptoms may begin.
Example Output:
bacteria ,cells ,toxins ,disease symptoms