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