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