1) After the following statements execute, what are the contents of the priority queue? PriorityQueueInterface myPriorityQueue = new LinkedPriorityQueue(); myPriorityQueue.add("a1"); myPriorityQueue.add("a4"); myPriorityQueue.add("a3"); myPriorityQueue.add("a2"); String st = myPriorityQueue.remove(); myPriorityQueue.add(st); myPriorityQueue.add (myPriorityQueue.peek()); myPriorityQueue.add("a2"); myPriorityQueue.remove();  Initially, assume myPriorityQueue is empty and priority is interpreted as coming first in a lexicographical ordering (dictionary order):

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