1 + 1 =, 2, 3, 4, 5, 2 + 2 =, 4, 5, 6, 7, 3 + 3 =, 6, 7, 8, 9, 4 + 4 =, 8, 9, 7, 6, 5 + 5 =, 10, 11, 9, 8

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