In {HEAD ~ response}, the second computer system is permitted {TAIL ~ access} to the requested software 
In { HEAD ~ response } , the second computer system is permitted { TAIL ~ access } to the requested software
OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH