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