*Inter9* So, what is the advantage of using a doubly linked list? Do you think it is worth using it? [1] *Inter11* What are three ways in which we can implement the priority Q? Describe each. (Hint: where to add? how to decide which to print?) [2] *Inter12* For each of the above, what is the worst case O-notation(s) for add and for remove where N is the number of items in the queue? [2]