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4. [10 marks] Give the pseudocode to find the second largest value into an unsorted singly linked list such as the one below. Note: Also handle cases where the list is empty or has just one element. head 7. 21* 519 3. 1 5. [10 marks] Show the steps of QuickSort (as given in the lectures) for the following array of values. Indicate the total number of comparisons made. (Hint: Each movement of lx or rx requires a comparison with the pivot.] 32 51078