digraph G {
node [style=filled, fillcolor="#cfe2f3", color="#4a90c4"];
subgraph cluster_tree {
label="Tree";
Root -> {Spine1 Spine2};
Spine1 -> {Leaf1 Leaf2};
}
subgraph cluster_torus {
label="Torus";
A -> B -> C -> A;
}
}