1 + 1 =, 2, 2 + 2 =, 4, 3 + 3 =, 6, 4 + 4 =, 8, 5 + 5 =, 10, 6 + 6 =, 12, 7 + 7 =, 14, 8 + 8 =, 16, 10 + 10 =, 20.

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