instruction:
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.
question:
What was developed in the summer of 1961?
answer:
proper


question:
When is the term private school never used in the US?
answer:
proper


question:
What is used to analyze or rather view the properties of crystals?
answer:

disfluent