In some embodiments, two or more of the codes retrieved by {HEAD ~ the reader} are backscattered by {TAIL ~ the tag} as a combination, as described above 
In some embodiments , two or more of the codes retrieved by { HEAD ~ the reader } are backscattered by { TAIL ~ the tag } as a combination , as described above
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH