11 + 12 =, 23, 8 + 9 =, 17, 6 + 7 =, 13, 9 + 10 =, 19, 11 + 10 =, 21, 1 + 2 =, 3, 4 + 5 =, 9, 7 + 8 =, 15, 3 + 4 =, 7, 5 + 6 =, 11, 2 + 3 =, 5, 12 + 13 = , 25.

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