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