digraph test{
    graph [
        layout = dot
    ];

    node0 -> node1 [label="child0"]
    node0 -> node2 [label="child1"]
    node1 -> node0 [label="parent"]
    node2 -> node0 [label="parent"]
    
    node1 -> node3 [label="child0"]
    node1 -> node4 [label="child1"]
    node3 -> node1 [label="parent"]
    node4 -> node1 [label="parent"]
    
    node2 -> node5 [label="child0"]
    node2 -> node6 [label="child1"]
    node5 -> node2 [label="parent"]
    node6 -> node2 [label="parent"]

    node3 -> node7 [label="child0"]
    node3 -> node8 [label="child1"]
    node7 -> node3 [label="parent"]
    node8 -> node3 [label="parent"]

    node4 -> node9 [label="child0"]
    node4 -> node10 [label="child1"]
    node9 -> node4 [label="parent"]
    node10 -> node4 [label="parent"]

    node5 -> node11 [label="child0"]
    node5 -> node12 [label="child1"]
    node11 -> node5 [label="parent"]
    node12 -> node5 [label="parent"]

    node6 -> node13 [label="child0"]
    node6 -> node14 [label="child1"]
    node13 -> node6 [label="parent"]
    node14 -> node6 [label="parent"]

    node7 -> node15 [label="child0"]
    node15 -> node7 [label="parent"]

}