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