RFID reader systems, readers, components, {HEAD ~ software} and methods cause {TAIL ~ RFID tags} to backscatter a combination made from at least portions of a first code and a second code, without transmitting any commands in the interim 
cause
RFID reader systems , readers , components , { HEAD ~ software } and methods cause { TAIL ~ RFID tags } to backscatter a combination made from at least portions of a first code and a second code , without transmitting any commands in the interim
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