Classify the input text into either disfluent questions or proper questions. A disfluent question is a question that has some interruptions in it while framing. A proper question is the correct form of the question without any disfluency.
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Question: What is the nervous system made up of?

Answer: proper

Question: What percentage of the population of London died during the 1471 breakout of the Black Death no um the 1589 breakout?

Answer: disfluent

Question: What is known for adapting and evolving slowly?

Answer:
proper