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