sentence 1: How do I build my profile for top B-schools?
 sentence 2: How do I build my profile for Harvard, Wharton, INSEAD etc.? sentence 1: What is it like to have conjoined twins?
 sentence 2: How hard is it to be the parent of conjoined twins? sentence 1: What really happened on 9/11?
 sentence 2: Why did 9/11 have to happen?
same meaning
same meaning
not same meaning