The terminal 5, said {TAIL ~ first and second encryption} means being constituted by {HEAD ~ a single encryption} means 
The terminal 5 , said { TAIL ~ first and second encryption } means being constituted by { HEAD ~ a single encryption } means
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH