Thus, {HEAD ~ detection} of the existence of a vulnerability is used to indicate {TAIL ~ noncompliance} with an associated requirement while absence of a vulnerability is used to indicate compliance with the associated requirement 
is used to indicate
Thus , { HEAD ~ detection } of the existence of a vulnerability is used to indicate { TAIL ~ noncompliance } with an associated requirement while absence of a vulnerability is used to indicate compliance with the associated requirement
OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH