More preferably, {HEAD ~ each} of the tags includes {TAIL ~ first identity data} defining a relative position of that tag, and second identity data identifying the surface 
includes
More preferably , { HEAD ~ each } of the tags includes { TAIL ~ first identity data } defining a relative position of that tag , and second identity data identifying the surface
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH