The base quality layer 102 requires no keys for {HEAD ~ access} in {TAIL ~ implementations} in which the base quality layer 102 is unencrypted 
in
The base quality layer 102 requires no keys for { HEAD ~ access } in { TAIL ~ implementations } in which the base quality layer 102 is unencrypted
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH