Given a statement and question, generate the answer to the question such that the answer is contained in the statement.
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Question: statement: a pulley is used for lifting mass, question: What is a pulley used for?

Answer: lifting mass


Question: statement: bears are related to marine mammals., question: What are bears related to?

Answer: marine mammals


Question: statement: a crane uses pulleys, question: What does a crane use?

Answer:
pulleys