sentence 1: How do I know if I'm good?
 sentence 2: How do I know what I'm good at? sentence 1: How can I whiten my teeth?
 sentence 2: What can I do to whiten my teeth? sentence 1: What constitutes a day?
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 sentence 2: If 'Wave Trap' prevents higher frequencies and passes line frequency of 50-60 Hz then how power line communication is done with transmission lines with carrer frequency of 50-500 kHz? sentence 1: When did you have your first sex?
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 sentence 2: Can you tell me everything about the Rosetta mission? sentence 1: What are some of the best jokes you've ever heard?
 sentence 2: What is the best joke you have ever heard? sentence 1: Who are some people who have affiliations at both University of Washington and Brown?
 sentence 2: Who are some people who have affiliations at both University of Washington and Caltech? sentence 1: Will HTC desire 828 dual sim get marshmallow update?
 sentence 2: Will HTC update the Desire X to Sense 5.0?
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