2 X 2, 4, 2 X 1, 2, 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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