{TAIL ~ a kind} of package selecting means of selectively specifying the kind of {HEAD ~ packages} to be packaged 
{ TAIL ~ a kind } of package selecting means of selectively specifying the kind of { HEAD ~ packages } to be packaged
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH