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

Ex Input:
What is cost engineers no no scratch that what is an obvious source for cost engineers?

Ex Output:
What is an obvious source for cost engineers?


Ex Input:
At which or no rather what time did a river system develop in the Upper Rhine Graben?

Ex Output:
What time did a river system develop in the Upper Rhine Graben?


Ex Input:
What river does Warsaw, nope, Berlin straddle?

Ex Output:
What river does Berlin straddle?