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