{HEAD ~ The invention} relates generally to {TAIL ~ computer systems}, and more particularly to an improved security model for computer systems 
relates generally to
{ HEAD ~ The invention } relates generally to { TAIL ~ computer systems } , and more particularly to an improved security model for computer systems
HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH