2 X 0, 0, 2 X 1 , 2, 2 X 2, 4, 2 X 3 , 6, 2 X 4 , 8, 2 X 5 , 10, 2 X 6 , 12, 2 X 7 , 14, 2 X 8 , 16, 2 X 9 , 18, 2 X 10, 20.

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