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:
Several types of gases form in the atmosphere. May come from different sources. The gases remain trapped in the atmosphere. Through the suns light the gases hold in heat and energy. Trap them in our atmosphere. The earth may become warmer this way. 

Ex Output:
several types of gases ,atmosphere ,earth ,heat ,energy 


Ex Input:
Magma rises through surrounding rock. Gas bubbles form and expand, causing lots of pressure. This pressure pushes the magma through weak spots in the earth's surface,. Magma flows out as lava. This can happen slowly or in a huge explosion. 

Ex Output:
magma ,gas bubbles ,pressure ,lava 


Ex Input:
Minerals fill spaces between bits of sediment. The sediments become glued together. The glued together parts become hard like cement. The sediment becomes a big rock. The rocks erode slowly. The rocks come apart. The rocks become smaller rocks. The rocks continue to erode into smaller rocks. The process starts again. 

Ex Output:

minerals ,sediment ,big rock; rocks ,smaller rocks