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

Example Input: When did Goldbach or wait Landau propose his four conjectural problems?
Example Output: When did Landau propose his four conjectural problems?

Example Input: When do excuse me Who do states and governments often work in lockstep with?
Example Output: Who do states and governments often work in lockstep with?

Example Input: How many er uh what do B cells help T cells produce?
Example Output:
What do B cells help T cells produce?