In this task you're given a question and you have to paraphrase the question to create the output question while retaining the meaning of the original question.

How many miles do motorcycle engine last?
What is the lifetime of a motorcycle engine?

What is the difference between a 2-legged stirrup and a 4-legged stirrup?
What is difference between shear force and bending moment?

How do I find the number that appears only once in an array of size n that has numbers that can appear multiple times?
How do I write an algorithm to search an array to make sure that all of its values appear at least twice?