1 + 1 = ...., 13, 14, 15, 2, 1 + 2 =, 7, 14, 17, 3, 5 + 5 =, 10, 11, 12, 19, 2 + 7 =, 5, 8, 9, 13, 2 + 2 =, 11, 12, 4, 18, 3 + 4 =, 6, 7, 11, 12.

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