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Example 2:

               (a) Ascending order: 7/11, 7/9, 7/6, 7/5, 7/2


               as 11 > 9 > 6 > 5 > 2


               (b) Descending order: 11/1, 11/5, 11/7, 11/10, 11/15

               as 1 < 5 < 7 < 10 < 15
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