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.

What does  crystals under a microscope I mean the orientation of the thin sections tell geologists?
disfluent

When did Galor and Zeria show old information about inequality?
proper

What did stratigraphic correlation replace?

proper

