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+digraph G {

+  bgcolor=blue

+  node [shape = circle,style=filled,fillcolor="white:black"]

+  subgraph cluster_1 { 

+    fontcolor="white"

+		n9 [gradientangle=360 label="n8:360"]

+		n8 [gradientangle=315 label="n8:315"]

+		n7 [gradientangle=270 label="n7:270"]

+		n6 [gradientangle=225 label="n6:225"]

+		n5 [gradientangle=180 label="n5:180"]

+		n4 [gradientangle=135 label="n4:135"]

+		n3 [gradientangle=90 label="n3:90 "]

+		n2 [gradientangle=45 label="n2:45 "]

+		n1 [gradientangle=0 label="n1:0  "]

+

+		label = "Linear Angle Variations (white to black gradient)";

+	}

+

+

+	subgraph cluster_2 { fontcolor="white"

+

+		node [style=radial]

+		n18 [gradientangle=360 label="n17:360"]

+		n17 [gradientangle=315 label="n17:315"]

+		n16 [gradientangle=270 label="n16:270"]

+		n15 [gradientangle=225 label="n15:225"]

+		n14 [gradientangle=180 label="n14:180"]

+		n13 [gradientangle=135 label="n13:135"]

+		n12 [gradientangle=90 label="n12:90 "]

+		n11 [gradientangle=45 label="n11:45 "]

+		n10 [gradientangle=0 label="n10:0  "]

+

+		label = "Radial Angle Variations (white to black gradient)";

+	}

+n5 -> n14;

+}