digraph D {
  rankdir="TB";
  label = "Натуральный строй";
  labelloc = "t"; // place the label at the top (b seems to be default)

  node [shape=plaintext]

  {
    rank=same;
    n_n2_p2  [label = "▲8:5"];
    n_n1_p2  [label = "▲8:5"];
    n_0_p2   [label = "▲8:5"];
    n_p1_p2  [label = "▲8:5"];
    n_p2_p2  [label = "▲8:5"];
  }

  {
    rank=same;
    n_n2_p1  [label = "●8:5"];
    n_n1_p1  [label = "●8:5"];
    n_0_p1   [label = "●5:4"];
    n_p1_p1  [label = "●8:5"];
    n_p2_p1  [label = "●8:5"];
  }

  {
    rank=same;
    n_n2_0   [label = "◊16:9"];
    n_n1_0   [label = "◊4:3"];
    n_0_0    [label = "◊1:1"];
    n_p1_0   [label = "◊3:2"];
    n_p2_0   [label = "◊9:8"];
  }

  {
    rank=same;
    n_n2_n1  [label = "■8:5"];
    n_n1_n1  [label = "■8:5"];
    n_0_n1   [label = "■8:5"];
    n_p1_n1  [label = "■8:5"];
    n_p2_n1  [label = "■8:5"];
  }

  {
    rank=same;
    n_n2_n2  [label = "▼8:5"];
    n_n1_n2  [label = "▼8:5"];
    n_0_n2   [label = "▼8:5"];
    n_p1_n2  [label = "▼8:5"];
    n_p2_n2  [label = "▼8:5"];
  }

  // horizontals
  n_n2_n2 -> n_n1_n2 -> n_0_n2 -> n_p1_n2 -> n_p2_n2;
  n_n2_n1 -> n_n1_n1 -> n_0_n1 -> n_p1_n1 -> n_p2_n1;
  n_n2_0  -> n_n1_0  -> n_0_0  -> n_p1_0  -> n_p2_0;
  n_n2_p1 -> n_n1_p1 -> n_0_p1 -> n_p1_p1 -> n_p2_p1;
  n_n2_p2 -> n_n1_p2 -> n_0_p2 -> n_p1_p2 -> n_p2_p2;
  // verticals
  n_n2_p2 -> n_n2_p1 -> n_n2_0 -> n_n2_n1 -> n_n2_n2;
  n_n1_p2 -> n_n1_p1 -> n_n1_0 -> n_n1_n1 -> n_n1_n2;
  n_0_p2  -> n_0_p1  -> n_0_0  -> n_0_n1  -> n_0_n2;
  n_p1_p2 -> n_p1_p1 -> n_p1_0 -> n_p1_n1 -> n_p1_n2;
  n_p2_p2 -> n_p2_p1 -> n_p2_0 -> n_p2_n1 -> n_p2_n2;
}