CORRECT: 2/9 + 5/9 = 7/9, 3/13 + 4/13 = 7/13, 5/14 + 6/14 = 11/14, 3/17 + 7/17 = 10/17, 5/21 + 14/21 = 19/21, 10/23 + 11/23 =21/23, 11/33 + 12/23 = 23/33, INCORRECT: 1/4 + 2/4 = 3/8, 3/7 + 6/8 = 9/8, 3/7 + 4/7 = 7/14, 5/14 + 6 /14 = 13/14, 8/17 + 8 /17 = 15/17,

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