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,

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