The data encoded by each tag includes an identity of the product item, an identity of the interface surface and {HEAD ~ the position} of {TAIL ~ the respective tag} on the interface surface 
of
The data encoded by each tag includes an identity of the product item , an identity of the interface surface and { HEAD ~ the position } of { TAIL ~ the respective tag } on the interface surface
OTH OTH 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 REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH