digraph Q {

  node [shape=record];


  nd_1   [label = "Node 1"];
  nd_2   [label = "Node 2"];
  nd_3_a [label = "Above Right Node 3"];
  nd_3_l [label = "Left of Node 3"];
  nd_3   [label = "Node 3"];
  nd_3_r [label = "Right of Node 3"];
  nd_4   [label = "Node 4"];


  nd_3_a -> nd_3_r;
  nd_1 -> nd_2 -> nd_3 -> nd_4;

  subgraph cluster_R {

    {rank=same nd_3_l nd_3 nd_3_r}

    nd_3_l -> nd_3 -> nd_3_r [color=grey arrowhead=none];

  }

}