The tests included in the security test scheme may take {HEAD ~ a variety} of {TAIL ~ different forms}, some examples of which are described herein 
of
The tests included in the security test scheme may take { HEAD ~ a variety } of { TAIL ~ different forms } , some examples of which are described herein
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH