2/7 + 3/7 =, 5/7, 4/7, 7/7, 6/7, 5/8 - 2/8 =, 7/8, 8/8, 3/8, 1/8, 7/9 - 4/9 =, 3/9, 1/3, 5/3, 1/9, 2 1/5 + 1 2/5 =, 1 1/5, 2 1/5, 2 2/5, 3 3/5, 3 2/6 + 2 1/6 =, 3 2/6, 4 5/6, 5 1/2, 6 1/2.

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