The method 60, wherein the region is identified with sufficient precision to distinguish {HEAD ~ the region} from {TAIL ~ 1.5×1014 other regions} 
from
The method 60 , wherein the region is identified with sufficient precision to distinguish { HEAD ~ the region } from { TAIL ~ 1.5×1014 other regions }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL