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