In {TAIL ~ some embodiments} {HEAD ~ the tag} backscatters a combination of its tag response and one or more other codes 
In
In { TAIL ~ some embodiments } { HEAD ~ the tag } backscatters a combination of its tag response and one or more other codes
REL TAIL TAIL TAIL TAIL TAIL TAIL HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH