public static <N, E> com.google.common.graph.@NotNull MutableNetwork<N, E> unwrapNetwork(@NotNull Network<N, E> network) {
    return ((MyMutableNetworkWrapper<N, E>)network).getDelegate();
  }
public static <N, E> com.google.common.graph.@NotNull MutableNetwork<N, E> unwrapNetwork(@NotNull Network<N, E> network)