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+digraph G {

+  bgcolor=blue

+

+

+  node [ style=filled]

+	subgraph cluster_1 { fontcolor=white

+		n5 [ shape="box",fillcolor="antiquewhite:aquamarine" ]

+		n4 [ shape="ellipse",fillcolor="bisque4:blue2" ]

+		n3 [ shape="circle",fillcolor="cadetblue1:chocolate1" ]

+		n2 [ shape="diamond",fillcolor="crimson:cyan4" ]

+		n1 [ shape="triangle",fillcolor="deepskyblue2:firebrick" ]

+		n0 [ shape="pentagon",fillcolor="gray24:gray88" ]

+

+		label = "X11 Colors";

+	}

+	subgraph cluster_2 { fontcolor=white

+		n11 [ shape="box",fillcolor="bisque:brown" ]

+		n10 [ shape="ellipse",fillcolor="green:darkorchid" ]

+		n9 [ shape="circle",fillcolor="deepskyblue:gold" ]

+		n8 [ shape="diamond",fillcolor="lightseagreen:orangered" ]

+		n7 [ shape="triangle",fillcolor="turquoise:salmon" ]

+		n6 [ shape="pentagon",fillcolor="snow:black" ]

+

+		label = "SVG Colors";

+	}

+	subgraph cluster_3 { fontcolor=white

+		n17 [ shape="box",fillcolor="/accent3/1:/accent3/3" ]

+		n16 [ shape="ellipse",fillcolor="/accent4/1:/accent4/4" ]

+		n15 [ shape="circle",fillcolor="/accent5/1:/accent5/5" ]

+		n14 [ shape="diamond",fillcolor="/accent6/1:/accent6/6" ]

+		n13 [ shape="triangle",fillcolor="/accent7/1:/accent7/7" ]

+		n12 [ shape="pentagon",fillcolor="/accent8/1:/accent8/8" ]

+

+		label = "Brewer - accent";

+	}

+	subgraph cluster_4 { fontcolor=white

+		n23 [ shape="box",fillcolor="/blues3/1:/blues3/2" ]

+		n22 [ shape="ellipse",fillcolor="/blues4/1:/blues4/3" ]

+		n21 [ shape="circle",fillcolor="/blues5/1:/blues5/4" ]

+		n20 [ shape="diamond",fillcolor="/blues6/1:/blues6/5" ]

+		n19 [ shape="triangle",fillcolor="/blues7/1:/blues7/6" ]

+		n18 [ shape="pentagon",fillcolor="/blues8/1:/blues8/7" ]

+

+		label = "Brewer - blues";

+	}

+

+n3 -> n9 -> n15 -> n21;

+}