IS_EMPTY
SIZE
ENQUE 1
ENQUE 2
ENQUE 3
SIZE
IS_EMPTY
FRONT
BACK
ENQUE 4
ENQUE 5
FRONT
BACK
SIZE
DEQUE
DEQUE
DEQUE
IS_EMPTY
SIZE
DEQUE
SIZE
FRONT
BACK
DEQUE
SIZE
IS_EMPTY



