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 the best book for electric power systems?
 sentence 2: Which book is best for electric power system? sentence 1: How do I know who to trust?
 sentence 2: How can you know if you can trust somebody? sentence 1: Why did you do breast implants?
 sentence 2: Why are breast implants not better? sentence 1: Why do people believe in flat earth?
 sentence 2: Why are there still people who believe the world is flat?
same meaning
same meaning
same meaning
not same meaning
same meaning