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Deletion Algorithm for dequeue
Step 1: [check for underflow] If front = 0 and rear = 0 Output "underflow" and return
Step 2: [delete element at front end] If front > 0 Value = q [front] Return [value]
Step 3: [check queue for empty] If front = rear Front = rear = 0 Else Front = front +1
Step 4: [delete element at the rear end] If rear > 0 Value = Q [rear] Return (rear)
Step 5: [check queue for empty] If front = rear Front = rear = 0 Else Rear = rear - 1
Step 6: Return
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