digraph {
node_1 [fillcolor="lavender", label="a", style="filled"]
node_2 [fillcolor="lavender", label="b", style="filled"]
node_1 -> node_2 [style="dotted"]
node_5 -> node_1
node_5 -> node_2
subgraph cluster_4 {
label="box"
node_5 [fillcolor="cornflowerblue", label="c", shape="circle", style="filled"]
}
}