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. 

[Q]: Warm air from the surface rises into the higher cold air. The water vapor in the air is condensed. The condensed water and dust forms a cloud. Wind in the cloud bounces the water droplets around. The bouncing droplets join together. The bigger droplets get heavy. The heavy droplets fall. As they fall, they join with more moisture in the air. The droplets get larger. Rain falls. 
[A]: warm air ,water vapor ,condensed water ,dust ,cloud ,water droplets ; droplets ,moisture ,rain 


[Q]: 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. 
[A]: several types of gases ,atmosphere ,earth ,heat ,energy 


[Q]: You take some paper. The writing tools. You write a message describing what's on your mind. You put the letter into an envelope. You take the letter to the post office. Send it to its recipient. 
[A]:
paper ,writing tool ,message ,letter