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+digraph "unix" {

+	graph [	fontname = "Helvetica",

+		fontsize = 36,

+		label = "\n\n\n\nObject Oriented Graphs\nStephen North, 3/19/93",

+		size = "6,6" ];

+	node [	shape = polygon,

+		sides = 4,

+		distortion = "0.0",

+		orientation = "0.0",

+		skew = "0.0",

+		color = white,

+		style = filled,

+		fontname = "Helvetica" ];

+	"5th Edition" [sides=9, distortion="0.936354", orientation=28, skew="-0.126818", color=salmon2];

+	"6th Edition" [sides=5, distortion="0.238792", orientation=11, skew="0.995935", color=deepskyblue];

+	"PWB 1.0" [sides=8, distortion="0.019636", orientation=79, skew="-0.440424", color=goldenrod2];

+	LSX [sides=9, distortion="-0.698271", orientation=22, skew="-0.195492", color=burlywood2];

+	"1 BSD" [sides=7, distortion="0.265084", orientation=26, skew="0.403659", color=gold1];

+	"Mini Unix" [distortion="0.039386", orientation=2, skew="-0.461120", color=greenyellow];

+	Wollongong [sides=5, distortion="0.228564", orientation=63, skew="-0.062846", color=darkseagreen];

+	Interdata [distortion="0.624013", orientation=56, skew="0.101396", color=dodgerblue1];

+	"Unix/TS 3.0" [sides=8, distortion="0.731383", orientation=43, skew="-0.824612", color=thistle2];

+	"PWB 2.0" [sides=6, distortion="0.592100", orientation=34, skew="-0.719269", color=darkolivegreen3];

+	"7th Edition" [sides=10, distortion="0.298417", orientation=65, skew="0.310367", color=chocolate];

+	"8th Edition" [distortion="-0.997093", orientation=50, skew="-0.061117", color=turquoise3];

+	"32V" [sides=7, distortion="0.878516", orientation=19, skew="0.592905", color=steelblue3];

+	V7M [sides=10, distortion="-0.960249", orientation=32, skew="0.460424", color=navy];

+	"Ultrix-11" [sides=10, distortion="-0.633186", orientation=10, skew="0.333125", color=darkseagreen4];

+	Xenix [sides=8, distortion="-0.337997", orientation=52, skew="-0.760726", color=coral];

+	"UniPlus+" [sides=7, distortion="0.788483", orientation=39, skew="-0.526284", color=darkolivegreen3];

+	"9th Edition" [sides=7, distortion="0.138690", orientation=55, skew="0.554049", color=coral3];

+	"2 BSD" [sides=7, distortion="-0.010661", orientation=84, skew="0.179249", color=blanchedalmond];

+	"2.8 BSD" [distortion="-0.239422", orientation=44, skew="0.053841", color=lightskyblue1];

+	"2.9 BSD" [distortion="-0.843381", orientation=70, skew="-0.601395", color=aquamarine2];

+	"3 BSD" [sides=10, distortion="0.251820", orientation=18, skew="-0.530618", color=lemonchiffon];

+	"4 BSD" [sides=5, distortion="-0.772300", orientation=24, skew="-0.028475", color=darkorange1];

+	"4.1 BSD" [distortion="-0.226170", orientation=38, skew="0.504053", color=lightyellow1];

+	"4.2 BSD" [sides=10, distortion="-0.807349", orientation=50, skew="-0.908842", color=darkorchid4];

+	"4.3 BSD" [sides=10, distortion="-0.030619", orientation=76, skew="0.985021", color=lemonchiffon2];

+	"Ultrix-32" [distortion="-0.644209", orientation=21, skew="0.307836", color=goldenrod3];

+	"PWB 1.2" [sides=7, distortion="0.640971", orientation=84, skew="-0.768455", color=cyan];

+	"USG 1.0" [distortion="0.758942", orientation=42, skew="0.039886", color=blue];

+	"CB Unix 1" [sides=9, distortion="-0.348692", orientation=42, skew="0.767058", color=firebrick];

+	"USG 2.0" [distortion="0.748625", orientation=74, skew="-0.647656", color=chartreuse4];

+	"CB Unix 2" [sides=10, distortion="0.851818", orientation=32, skew="-0.020120", color=greenyellow];

+	"CB Unix 3" [sides=10, distortion="0.992237", orientation=29, skew="0.256102", color=bisque4];

+	"Unix/TS++" [sides=6, distortion="0.545461", orientation=16, skew="0.313589", color=mistyrose2];

+	"PDP-11 Sys V" [sides=9, distortion="-0.267769", orientation=40, skew="0.271226", color=cadetblue1];

+	"USG 3.0" [distortion="-0.848455", orientation=44, skew="0.267152", color=bisque2];

+	"Unix/TS 1.0" [distortion="0.305594", orientation=75, skew="0.070516", color=orangered];

+	"TS 4.0" [sides=10, distortion="-0.641701", orientation=50, skew="-0.952502", color=crimson];

+	"System V.0" [sides=9, distortion="0.021556", orientation=26, skew="-0.729938", color=darkorange1];

+	"System V.2" [sides=6, distortion="0.985153", orientation=33, skew="-0.399752", color=darkolivegreen4];

+	"System V.3" [sides=7, distortion="-0.687574", orientation=58, skew="-0.180116", color=lightsteelblue1];

+	"5th Edition" -> "6th Edition";

+	"5th Edition" -> "PWB 1.0";

+	"6th Edition" -> LSX;

+	"6th Edition" -> "1 BSD";

+	"6th Edition" -> "Mini Unix";

+	"6th Edition" -> Wollongong;

+	"6th Edition" -> Interdata;

+	Interdata -> "Unix/TS 3.0";

+	Interdata -> "PWB 2.0";

+	Interdata -> "7th Edition";

+	"7th Edition" -> "8th Edition";

+	"7th Edition" -> "32V";

+	"7th Edition" -> V7M;

+	"7th Edition" -> "Ultrix-11";

+	"7th Edition" -> Xenix;

+	"7th Edition" -> "UniPlus+";

+	V7M -> "Ultrix-11";

+	"8th Edition" -> "9th Edition";

+	"1 BSD" -> "2 BSD";

+	"2 BSD" -> "2.8 BSD";

+	"2.8 BSD" -> "Ultrix-11";

+	"2.8 BSD" -> "2.9 BSD";

+	"32V" -> "3 BSD";

+	"3 BSD" -> "4 BSD";

+	"4 BSD" -> "4.1 BSD";

+	"4.1 BSD" -> "4.2 BSD";

+	"4.1 BSD" -> "2.8 BSD";

+	"4.1 BSD" -> "8th Edition";

+	"4.2 BSD" -> "4.3 BSD";

+	"4.2 BSD" -> "Ultrix-32";

+	"PWB 1.0" -> "PWB 1.2";

+	"PWB 1.0" -> "USG 1.0";

+	"PWB 1.2" -> "PWB 2.0";

+	"USG 1.0" -> "CB Unix 1";

+	"USG 1.0" -> "USG 2.0";

+	"CB Unix 1" -> "CB Unix 2";

+	"CB Unix 2" -> "CB Unix 3";

+	"CB Unix 3" -> "Unix/TS++";

+	"CB Unix 3" -> "PDP-11 Sys V";

+	"USG 2.0" -> "USG 3.0";

+	"USG 3.0" -> "Unix/TS 3.0";

+	"PWB 2.0" -> "Unix/TS 3.0";

+	"Unix/TS 1.0" -> "Unix/TS 3.0";

+	"Unix/TS 3.0" -> "TS 4.0";

+	"Unix/TS++" -> "TS 4.0";

+	"CB Unix 3" -> "TS 4.0";

+	"TS 4.0" -> "System V.0";

+	"System V.0" -> "System V.2";

+	"System V.2" -> "System V.3";

+}