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

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