Revise the implementation of quick sort as follows. If the array has 7 entries, choose the middle entry as the pivot. For arrays of between 8 and 40 entries, use the median-of-three pivot-selection scheme described in Segments 9.14 and 9.16. For larger arrays, the pivot is the median of 9 entries that are about equally spaced, including the first, last, and middle entries. For arrays of fewer than 7 entries, use insertion sort instead of quick sort.
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