Group 1, Group 2, 8 + 5 = 10 + 3, 8 + 3 = 10 + 1, 8 + 5 = 10 + 4, 8 + 7 = 10 + 5, 8 + 9 = 10 + 7, 8 + 4 = 10 + 2

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