3 + 3 =, 4 + 4 =, 5 + 5 =, 6 + 6 =, 7 + 7 =, 8 + 8 =, 9 + 9 =, 3 + 4 =, 4 + 5 =, 5 + 6 =, 6 + 7 =, 7 + 8 =, 8 + 9 =.

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