Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
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Question: A vapor light produces visible light by electroluminescence process.

Answer: A vapor light produces visible light by what process?


Question: A fewer predators is most likely to cause the number of rabbits living in an area to increase.

Answer: Which factor is most likely to cause the number of rabbits living in an area to increase?


Question: The atom in a neutron is found in the the nucleus.

Answer:
Where in the atom is a neutron found?