1. IF AVAIL = NULL, THEN
	WRITE: OVERFLOW AND EXIT.
2. NEW = AVAIL AND AVAIL = LINK[AVAIL]
3. LINK[REAR] = NEW
4. LINK[NEW] = NULL
5. REAR = NEW
6. INFO[REAR] = ITEM

1. IF FRONT = NULL, THEN
	WRITE: UNDERFLOW AND EXIT.
2. ITEM = INFO[FRONT]
3. PTR = FRONT
4. FRONT = LINK[FRONT]
5. LINK[PTR] = AVAIL AND AVAIL = PTR