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

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