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