{TAIL ~ The steps} of {HEAD ~ the method} include adding new links to the network topology model to protect against single node failures, and adjusting link weights for the network topology model to reduce at least one of a cost of network operation and an imbalance in link utilizations 
{ TAIL ~ The steps } of { HEAD ~ the method } include adding new links to the network topology model to protect against single node failures , and adjusting link weights for the network topology model to reduce at least one of a cost of network operation and an imbalance in link utilizations
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