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

Q: What percentage not that I mean when was the great plague of London?

A: When was the great plague of London?
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Q: In what year did David Tappan die make that Harvard President Joseph Willard?

A: In what year did Harvard President Joseph Willard die?
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Q: What is the observable effect of beta decay no sorry of W and Z boson exchange?

A:
What is the observable effect of W and Z boson exchange?
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