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Which of the following CANNOT be the lengths of the sides of an obtuse triangle?

(A) $\ \ 5, 6, 10$ (B) $\ \ 6, 6, 6\sqrt{2}$ (C) $\ \ 6, 8, 11$ (D) $\ \ 10, 15, 20$ (E) $\ \ 20n, 30n, 40n$

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