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+/*

+ * The transitive 6-net, also known as Heawood's graph,

+ * can be used to test the "stability points" of the layout

+ * algorithm.

+

+ * The "ideal" layout occurs when len="2.5". The layout

+ * loses the regularity when smaller values are used.

+ */

+graph "Heawood" {

+	node [

+		fontname = "Arial"

+		label = "\N"

+		shape = "circle"

+		width = "0.50000"

+		height = "0.500000"

+		color = "black"

+	]

+	edge [

+		color = "black"

+	]

+	/* The outer wheel */

+	"0" -- "1" -- "2" -- "3" -- "4" -- "5" -- "6" -- "7" -- "8" -- "9" -- "10" -- "11" -- "12" -- "13" -- "0";

+	/* The internal edges. The len = makes them internal */

+	"0" -- "5" [len = 2.5];

+	"2" -- "7" [len = 2.5];

+	"4" -- "9" [len = 2.5];

+	"6" -- "11" [len = 2.5];

+	"8" -- "13" [len = 2.5];

+	"10" -- "1" [len = 2.5];

+	"12" -- "3" [len = 2.5];

+}