this.allowsParallelEdges = allowsParallelEdges;
    this.nodeOrder = nodeOrder;
    this.edgeOrder = edgeOrder;
  }

  @Override
  MutableNetwork<Integer, String> createGraph() {
    return NetworkBuilder.directed()
        .allowsSelfLoops(allowsSelfLoops)
        .allowsParallelEdges(allowsParallelEdges)
        .nodeOrder(nodeOrder)
        .edgeOrder(edgeOrder)
        .build();
  }

  @Override

   *
   * <p>The default value is {@code false}.
   */
  @CanIgnoreReturnValue
  public NetworkBuilder<N, E> allowsParallelEdges(boolean allowsParallelEdges) {
    this.allowsParallelEdges = allowsParallelEdges;
    return this;
  }

  /**
   * Specifies whether the network will allow self-loops (edges that connect a node to itself).

    this.allowsParallelEdges = allowsParallelEdges;
    this.nodeOrder = nodeOrder;
    this.edgeOrder = edgeOrder;
  }

  @Override
  MutableNetwork<Integer, String> createGraph() {
    return NetworkBuilder.undirected()
        .allowsSelfLoops(allowsSelfLoops)
        .allowsParallelEdges(allowsParallelEdges)
        .nodeOrder(nodeOrder)
        .edgeOrder(edgeOrder)
        .build();
  }

  @Override

    this.allowsParallelEdges = allowsParallelEdges;
    this.nodeOrder = nodeOrder;
    this.edgeOrder = edgeOrder;
  }

  @Override
  MutableNetwork<Integer, String> createGraph() {
    return NetworkBuilder.undirected()
        .allowsSelfLoops(allowsSelfLoops)
        .allowsParallelEdges(allowsParallelEdges)
        .nodeOrder(nodeOrder)
        .edgeOrder(edgeOrder)
        .build();
  }

  @Override

    this.allowsParallelEdges = allowsParallelEdges;
    this.nodeOrder = nodeOrder;
    this.edgeOrder = edgeOrder;
  }

  @Override
  MutableNetwork<Integer, String> createGraph() {
    return NetworkBuilder.directed()
        .allowsSelfLoops(allowsSelfLoops)
        .allowsParallelEdges(allowsParallelEdges)
        .nodeOrder(nodeOrder)
        .edgeOrder(edgeOrder)
        .build();
  }

  @Override

  @Test
  public void equivalent_propertiesDiffer() {
    network.addEdge(N1, N2, E12);

    MutableNetwork<Integer, String> g2 =
        NetworkBuilder.from(network)
            .allowsParallelEdges(!network.allowsParallelEdges())
            .allowsSelfLoops(!network.allowsSelfLoops())
            .build();
    g2.addEdge(N1, N2, E12);

    assertThat(network).isEqualTo(g2);
  }

    return true;
  }

  private NetworkConnections<N, E> newConnections() {
    return isDirected()
        ? allowsParallelEdges()
            ? DirectedMultiNetworkConnections.<N, E>of()
            : DirectedNetworkConnections.<N, E>of()
        : allowsParallelEdges()
            ? UndirectedMultiNetworkConnections.<N, E>of()
            : UndirectedNetworkConnections.<N, E>of();
  }

    this.allowsSelfLoops = allowsSelfLoops;
    this.allowsParallelEdges = allowsParallelEdges;
    this.nodeOrder = nodeOrder;
    this.edgeOrder = edgeOrder;
  }

  @Override
  Network<Integer, String> createGraph() {
    networkBuilder =
        NetworkBuilder.directed()
            .allowsSelfLoops(allowsSelfLoops)
            .allowsParallelEdges(allowsParallelEdges)
            .nodeOrder(nodeOrder)

    this.allowsSelfLoops = allowsSelfLoops;
    this.allowsParallelEdges = allowsParallelEdges;
    this.nodeOrder = nodeOrder;
    this.edgeOrder = edgeOrder;
  }

  @Override
  Network<Integer, String> createGraph() {
    networkBuilder =
        NetworkBuilder.directed()
            .allowsSelfLoops(allowsSelfLoops)
            .allowsParallelEdges(allowsParallelEdges)
            .nodeOrder(nodeOrder)

    return delegate().edges();
  }

  @Override
  public boolean isDirected() {
    return delegate().isDirected();
  }

  @Override
  public boolean allowsParallelEdges() {
    return delegate().allowsParallelEdges();
  }

  @Override
  public boolean allowsSelfLoops() {
    return delegate().allowsSelfLoops();
  }

  @Override
  public ElementOrder<N> nodeOrder() {