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

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