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