Step 1: IF START = NULL Write UNDERFLOW Go to Step 8 [END OF IF] Step 2: SET PTR = START Step 3: Repeat Step 4 while PTR -> NEXT != START Step 4: SET PTR = PTR -> NEXT [END OF LOOP] Step 5: SET PTR -> PREV -> NEXT = START Step 6: SET START -> PREV = PTR -> PREV Step 7: FREE PTR Step 8: EXTI