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

Ex Input:
Where did Mongke Khan attack the Song dynasty or rather where did he defend it?

Ex Output:
 Where did Mongke Khan defend the Song dynasty?


Ex Input:
What is sorry What makes detection by killer T cells more likely?

Ex Output:
What makes detection by killer T cells more likely?


Ex Input:
What does X.25's principal operations concern no integrity?

Ex Output:
What does X.25's integrity operations concern?