{HEAD ~ A package identifier} for {TAIL ~ a package} from which an application is installed on a computing device is obtained 
for
{ HEAD ~ A package identifier } for { TAIL ~ a package } from which an application is installed on a computing device is obtained
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH