Preferably, {TAIL ~ the coded data} includes {HEAD ~ at least one tag}, each tag being indicative of the region identity and the position of the tag within the region 
Preferably , { TAIL ~ the coded data } includes { HEAD ~ at least one tag } , each tag being indicative of the region identity and the position of the tag within the region
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH