* @param <E> Edge parameter type
 */
final class DirectedNetworkConnections<N, E> extends AbstractDirectedNetworkConnections<N, E> {

  DirectedNetworkConnections(Map<E, N> inEdgeMap, Map<E, N> outEdgeMap, int selfLoopCount) {
    super(inEdgeMap, outEdgeMap, selfLoopCount);
  }

  static <N, E> DirectedNetworkConnections<N, E> of() {
    return new DirectedNetworkConnections<>(

 * @param <E> Edge parameter type
 */
final class DirectedNetworkConnections<N, E> extends AbstractDirectedNetworkConnections<N, E> {

  DirectedNetworkConnections(Map<E, N> inEdgeMap, Map<E, N> outEdgeMap, int selfLoopCount) {
    super(inEdgeMap, outEdgeMap, selfLoopCount);
  }

  static <N, E> DirectedNetworkConnections<N, E> of() {
    return new DirectedNetworkConnections<>(