Given a disfluent sentence, modify the sentence to it to its equivalent fluent form, preserving the meaning of the sentence.

[EX Q]: What is the principle or uh when is the correlation occasionally positive?
[EX A]: When is the correlation occasionally positive?

[EX Q]: What did the American Philosophical Society do with the memoir what did they produce in 1809?
[EX A]: What did the American Philosophical Society produce in 1809?

[EX Q]: What lens do petrologists use no just what lens it is that is used to identify chemical composition?
[EX A]:
What lens is used to identify chemical composition?