digraph "unix" {
graph [ fontname = "Helvetica-Oblique",
fontsize = 36,
label = "Object Oriented Graphs",
];
node [ shape = polygon,
sides = 4,
distortion = "0.0",
orientation = "0.0",
skew = "0.0",
color = white,
style = filled,
fontname = "Helvetica-Outline" ];
"5th Edition" [sides=3, distortion="0",
orientation=0, skew="0", color=salmon2];
"6th Edition" [sides=5, distortion="0.238792",
orientation=11, skew="0.995935", color=deepskyblue];
"PWB 1.0" [sides=8, color=goldenrod2];
"Mini Unix" [distortion="0.039386",
orientation=2, skew="-0.461120", color=greenyellow];
Wollongong [sides=5, color=darkseagreen];
Interdata [distortion="0.624013",
orientation=56, skew="0.101396", color=dodgerblue1];
"Unix/TS 3.0" [sides=8, color=thistle2];
"PWB 2.0" [sides=6, color=darkolivegreen3];
"7th Edition" [sides=10, color=chocolate];
"8th Edition" [color=turquoise3];
"32V" [sides=7, color=steelblue3];
V7M [sides=10, color=navy];
"Ultrix-11" [sides=10, color=darkseagreen4];
"5th Edition" -> "6th Edition";
"5th Edition" -> "PWB 1.0";
"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";
V7M -> "Ultrix-11";
}