Show intermediate steps of sorting the array 18, 11, 16, 14, 5, 13, 8, 10, 17, 9, 6, 15, 4 with Quick Sort. Show the result after picking a pivot for each sublist and arranging the list in such a way that all elements smaller than pivot are on the left side of the pivot, and all elements greater than or equal pivot are on the right. Pick the middle element as the pivot.