sentence 1: How do I know if I'm good?
 sentence 2: How do I know what I'm good at? sentence 1: What is good way (mathematics research) to measure similarity between unequal-length vector rather than equal-length vector (say, cosine similarity)?
 sentence 2: LinkedIn Pulse Comments to Excel? sentence 1: What are some examples of static friction?
 sentence 2: What are some examples of friction?
not same meaning
not same meaning
not same meaning