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