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

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

How is no no um what is the stage 1 in the life of a bill?
What is stage 1 in the life of a bill?

What is known of enzymes mechanisms oops I mean known for adapting and evolving slowly?
What is known for adapting and evolving slowly?