digraph  {
        graph [compound=true,
                label="p4.log",
                rankdir=TB,
                ranksep="1.0 equally"
        ];
        node [fontsize=24,
                label="\N",
                shape=circle
        ];
        {
                graph [rank=same];
                0                [shape=box];
                1                [shape=box];
                2                [shape=box];
                3                [shape=box];
        }
        subgraph cluster0 {
                graph [label=Proc0];
                "201_0"          [rank=source,
                        style=invis];
                "301_0"          [label=< 301<br/>1693 >];
                "201_0" -> "301_0"               [style=invis];
                "401_0"          [style=invis];
                "301_0" -> "401_0"               [style=invis];
                "501_0"          [label=< 501<br/>2140 >];
                "401_0" -> "501_0"               [style=invis];
                "601_0"          [label=< 601<br/>1836 >];
                "501_0" -> "601_0"               [style=invis];
                "701_0"          [label=< 701<br/>1589 >];
                "601_0" -> "701_0"               [style=invis];
                "801_0"          [label=< 801<br/>1244 >];
                "701_0" -> "801_0"               [style=invis];
                "803_0"          [style=invis];
                "801_0" -> "803_0"               [style=invis];
                "901_0"          [label=< 901<br/>2706 >];
                "803_0" -> "901_0"               [style=invis];
        }
        subgraph cluster1 {
                graph [label=Proc1];
                "201_1"          [label=< 201<br/>2358>,
                        rank=source];
                "301_1"          [label=< 301<br/>3461 >];
                "201_1" -> "301_1"               [style=invis];
                "401_1"          [label=< 401<br/>2116 >];
                "301_1" -> "401_1"               [style=invis];
                "501_1"          [label=< 501<br/>1671 >];
                "401_1" -> "501_1"               [style=invis];
                "601_1"          [label=< 601<br/>1899 >];
                "501_1" -> "601_1"               [style=invis];
                "701_1"          [label=< 701<br/>1585 >];
                "601_1" -> "701_1"               [style=invis];
                "801_1"          [label=< 801<br/>2925 >];
                "701_1" -> "801_1"               [style=invis];
                "803_1"          [style=invis];
                "801_1" -> "803_1"               [style=invis];
                "901_1"          [label=< 901<br/>2389 >];
                "803_1" -> "901_1"               [style=invis];
        }
        subgraph cluster2 {
                graph [label=Proc2];
                "201_2"          [label=< 201<br/>1919>,
                        rank=source];
                "301_2"          [label=< 301<br/>1411 >];
                "201_2" -> "301_2"               [style=invis];
                "401_2"          [style=invis];
                "301_2" -> "401_2"               [style=invis];
                "501_2"          [label=< 501<br/>2365 >];
                "401_2" -> "501_2"               [style=invis];
                "601_2"          [label=< 601<br/>2122 >];
                "501_2" -> "601_2"               [style=invis];
                "701_2"          [label=< 701<br/>1367 >];
                "601_2" -> "701_2"               [style=invis];
                "801_2"          [style=invis];
                "701_2" -> "801_2"               [style=invis];
                "803_2"          [label=< 803<br/>1606 >];
                "801_2" -> "803_2"               [style=invis];
                "901_2"          [label=< 901<br/>1832 >];
                "803_2" -> "901_2"               [style=invis];
        }
        subgraph cluster3 {
                graph [label=Proc3];
                "201_3"          [rank=source,
                        style=invis];
                "301_3"          [label=< 301<br/>2685 >];
                "201_3" -> "301_3"               [style=invis];
                "401_3"          [label=< 401<br/>1381 >];
                "301_3" -> "401_3"               [style=invis];
                "501_3"          [style=invis];
                "401_3" -> "501_3"               [style=invis];
                "601_3"          [style=invis];
                "501_3" -> "601_3"               [style=invis];
                "701_3"          [label=< 701<br/>1612 >];
                "601_3" -> "701_3"               [style=invis];
                "801_3"          [label=< 801<br/>2688 >];
                "701_3" -> "801_3"               [style=invis];
                "803_3"          [style=invis];
                "801_3" -> "803_3"               [style=invis];
                "901_3"          [style=invis];
                "803_3" -> "901_3"               [style=invis];
        }
        0 -> "201_0"     [lhead=cluster0];
        1 -> "201_1"     [lhead=cluster1];
        2 -> "201_2"     [lhead=cluster2];
        "201_2" -> "301_3";
        3 -> "201_3"     [lhead=cluster3];
        "401_3" -> "201_1";
        "401_3" -> "301_2";
        "401_3" -> "801_3";
        "601_0" -> "601_1";
        "601_0" -> "601_2";
        "701_2" -> "701_0";
        "701_2" -> "701_1";
        "701_3" -> "301_1";
        "701_3" -> "301_0";
        "801_0" -> "801_1";
        "801_0" -> "803_2";
        "901_2" -> "901_0";
}