The System sends {TAIL ~ a number} that must be incorporated into the response from {HEAD ~ a valid Authentication Chip} 
The System sends { TAIL ~ a number } that must be incorporated into the response from { HEAD ~ a valid Authentication Chip }
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD