{HEAD ~ The receipt} and processing of the communication packet may be acknowledged by the central controller to {TAIL ~ computer}  
acknowledged to
{ HEAD ~ The receipt } and processing of the communication packet may be acknowledged by the central controller to { TAIL ~ computer }
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH REL OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL OTH