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]: Bees go out during the day and gather food. Then while gathering of their food, they make wax, which is the building block of their bee hive. Bees make food called honey. They use a sticky, glue-like substance called propolis as a binding to hold their hives together. Bees produce all of the building blocks to build their hive in their own body. 
[A]: bees ,food ,wax ,honey ,propolis ,hives 


[Q]: The coal is placed in a heater. The coal is super heated. The heat is connected to a boiler. The boiler is full of water. The heat turns the water into steam. The steam turns a generator. The generator produces the electricity. 
[A]: coal ,heat ,water ,steam ,generator ,electricity 


[Q]: Something happens to produce a sound. The sound travels in waves. The sound waves hit an object. The object absorbs some of the sound waves. Some of the sound waves bounce off of the object. The reflected sound waves can be heard, though they have slightly different properties than the original sound. The sound continues to bounce off of things and produce echoes until it is totally absorbed or dissipated. 
[A]:
sound ; sound waves ,echoes 


