Correct: 4 /5, 3/7, 7/9, 9/12, 17/20, 10/15, 12/17, 6 /8, 4 /9, 5 /7, Incorrect: 5 /3, 9/4, 8/5, 4 /3, 6 /4, 8/7, 10/3, 15/6, 18/5, 7 /2,

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