docs: protected Map.Entry<TrustGraphNodeId,TrustGraphNodeId> randomRoute() {
          final int routeNumber = rng.nextInt(routingTable.size()); 
          final Iterator<Map.Entry<TrustGraphNodeId,TrustGraphNodeId>> routes =
                  routingTable.entrySet().iterator();
          for (int i = 0; i < routeNumber; i++) { routes.next(); }
          return routes.next();
      }