Given a disfluent sentence, modify the sentence to it to its equivalent fluent form, preserving the meaning of the sentence.
One example is below.
Q: Who did the Han Chinese want to help the Khitan no I mean the Mongols fight?
A: Who did the Han Chinese want to help the Mongols fight?
Rationale: The input initially means Khitan and then changes to Mongols, hence this is correct.
Q: Where do what activity maintains topographic gradients?
A:
What activity maintains topographic gradients?