In certain embodiments, the reader may receive the SAPK from {HEAD ~ the reader}, for example in a combination backscattered by the tag at {TAIL ~ operation} 2002 
In certain embodiments , the reader may receive the SAPK from { HEAD ~ the reader } , for example in a combination backscattered by the tag at { TAIL ~ operation } 2002
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH