{HEAD ~ An enforcement mechanism} uses the access rights set up for {TAIL ~ the user} to determine whether to grant or deny accesses to resources 
{ HEAD ~ An enforcement mechanism } uses the access rights set up for { TAIL ~ the user } to determine whether to grant or deny accesses to resources
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH