<strong><em>A.</em></strong> Example one digraph G { Graph[bgcolor="transparent", rankdir="LR"]; node[style="filled", shape="circle", fillcolor="aliceblue", color="deepskyblue3", penwidth=2]; subgraph cluster_0 { m1[label="1"]; m2[label="2"]; m3[label="3", fillcolor="lightskyblue1"]; m1 -> m2 -> m3; penwidth=2; label = "Mainstream"; color="deepskyblue1"; } subgraph cluster_1 { l1[label="1"]; l2[label="2"]; l3[label="3'", fillcolor="darkseagreen1"]; l1 -> l2 -> l3; penwidth=2; label = "Local"; color="darkseagreen2"; } } G cluster_0 Mainstream cluster_1 Local m1 1 m2 2 m1->m2 m3 3 m2->m3 l1 1 l2 2 l1->l2 l3 3' l2->l3
<strong><em>B.</em></strong> Example two graph H { node[style="filled", shape="circle", fillcolor="aliceblue", color="deepskyblue3", penwidth=2]; m1[label="1"]; m2[label="2"]; m1 -- m2; } H m1 1 m2 2 m1--m2