1 + 1 = , 2, 2 + 2 = , 4, 3 + 3 = , 6, 4 + 4 = , 8, 5 + 5 = , 10, 6 + 6 = , 12, 7 + 7 = , 14, 8 + 8 = , 16, 9 + 9 = , 18, 10 + 10 = , 20, 11 + 11 = , 22, 12 + 12 = , 24.

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