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