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:
Pressure happens underground. Tectonic plates underground pull and stretch. Small cracks are formed in the earth's crust. The tectonic plates push hard against each other. Some parts of the earth's crust move up high above the ground. 

Ex Output:
pressure ,tectonic plates ,cracks ,earth's crust 


Ex Input:
Plants start growing on or near the rocks. The roots of the growing plants start to break up the rock. The plant acids dissolve the rock. The rock is broken down into smaller pieces. Erosion begins. 

Ex Output:
plants ,rocks ; rock ,roots ,smaller pieces 


Ex 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. 

Ex Output:

bacteria ,cells ,toxins ,disease symptoms