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