4, 1 + 3 =, 3, 2 + 1 =, 5, 1 + 4 =, 15, 8 + 7 =, 19, 3 + 16 =, 2, 2 + 0 =, 13, 1 + 12 =, 14, 7 + 7 =, 20, 8 + 12 =, 17, 11 + 7 =, 7, 1 + 6 =, 12, 10 + 2 =, 16, 15 + 1 =, 10, 5 + 5 =

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