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enqueue: This adds an element to the rear end of the queue. Overflow conditions occur if the queue is full.
dequeue: This removes an element from the front end of the queue. Underflow conditions occur if the queue is empty.
isEmpty: This returns true if the queue is empty or else false.
rear: This returns the rear end element without removing it.
front: This returns the front-end element without removing it.
size: This returns the size of the queue.