2/7 + 4/7 =, 6/14, 6/7, 7/6, 2/7, 1/5 + 2/5 =, 3/10, 1/10, 3/5, 1 2/5, 1/3 + 1/6 =, 2/6, 2/9, 5/6, 3/6, 7/10 + 1/5 =, 8/10, 9/10, 8/15, 9/15, 2/3 + 1/4 =, 11/12, 6/8, 3/7, 3/12, 5/6 + 1/4 =, 13/12, 6/10, 10/12, 8/12, 3/4 + 3/5, 6/9, 6/20, 12/20, 27/20.

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