Retrieving Element without Removing
suggest change//Retrieves, but does not remove, the head of the queue represented by this deque
Object headItem = deque.element();
//Retrieves, but does not remove, the first element of this deque.
Object firstItem = deque.getFirst();
//Retrieves, but does not remove, the last element of this deque.
Object lastItem = deque.getLast();
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