8, 4 + 4 =, 4, 1 + 3 =, 10, 9 + 1 =, 17, 13 + 4 =, 18, 2 + 16 =, 20, 10 + 10 =, 19, 19 + 0 =, 7, 6 + 1 =, 14, 7 + 7 =, 11, 2 + 9 =, 1, 5 - 4 =, 15, 17 - 2 =, 9, 10 - 1 =, 6, 8 - 2 = , 3, 7 - 4 =  , 2, 5 - 3 =, 12, 14 - 2 =, 16, 19 - 3 = , 5, 10 - 5 = , 13, 16 - 3 = .

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