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Official guide questions collection
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Re: If x and y are integers, is 2xy < x^2 + y^2?
Jun 27, 2017
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Re: Does the integer k have a factor p such that 1 < p < k ?
Jul 09, 2017
2
If x ≠ 0, is x > 1?
May 22, 2017
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Manhattan's idioms list
Aug 30, 2017
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