said sub step in step further comprises determining {HEAD ~ the survivability characteristics} of {TAIL ~ the modified network topology}; and 
of
said sub step in step further comprises determining { HEAD ~ the survivability characteristics } of { TAIL ~ the modified network topology } ; and
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH