Preferable, {HEAD ~ restricted tokens} are used to implement {TAIL ~ the location} based discrimination by restricting the access of users connecting from less trusted locations 
are used to implement
Preferable , { HEAD ~ restricted tokens } are used to implement { TAIL ~ the location } based discrimination by restricting the access of users connecting from less trusted locations
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH