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