A scanning device 1, wherein the data encoded by the tags is redundantly encoded and the processor uses {HEAD ~ the redundantly encoded data} to detect {TAIL ~ one or more errors} therein 
to detect
A scanning device 1 , wherein the data encoded by the tags is redundantly encoded and the processor uses { HEAD ~ the redundantly encoded data } to detect { TAIL ~ one or more errors } therein
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH