At steps 414 416, {TAIL ~ aggregated stream data} is stored in {HEAD ~ one or more locations} 
At steps 414 416 , { TAIL ~ aggregated stream data } is stored in { HEAD ~ one or more locations }
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD