The application means selects the desired packet data network identifiers based on {TAIL ~ services} requested by {HEAD ~ applications} 
The application means selects the desired packet data network identifiers based on { TAIL ~ services } requested by { HEAD ~ applications }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD