A coherent set of {HEAD ~ data} and {TAIL ~ code} is under no circumstances output from the apparatus to the data system of lower secrecy and security level 
A coherent set of { HEAD ~ data } and { TAIL ~ code } is under no circumstances output from the apparatus to the data system of lower secrecy and security level
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH