sentence 1: How do I know if I'm good?
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 sentence 2: What are convection currents and how are they created? sentence 1: How do I find the closed form of the sum: [math]\sum_{k=1}^{n} (3)^k \binom{n}{k}[/math]?
 sentence 2: How can I find the closed form of the sum [math]\sum_{k=1}^{n} {k(k-1)} \binom{n}{k}[/math]? sentence 1: What is a set-top box?
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 sentence 2: What are the most inspirational recent movies? sentence 1: What could be the reason why iPhone sales dropped for the first time?
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