In this task, you're given an open-domain question. Your task is to provide an answer to the given question. There is only one unique answer for each question. Your answer should be short, and refer to an entity, date, number, etc. Do not put your answer in the context of a sentence.
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Question: Who did the soviet union signed a nonaggression pact with in 1939?

Answer: Nazi Germany


Question: How many episodes are on season 3 of empire?

Answer: 18


Question: What episode does grey's anatomy have a shooting?

Answer:
Death and All His Friends