If the proximity criterion is not sufficient for deciding, then {HEAD ~ additional properties} can be used to ensure {TAIL ~ reliable correlation} 
used to ensure
If the proximity criterion is not sufficient for deciding , then { HEAD ~ additional properties } can be used to ensure { TAIL ~ reliable correlation }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL