1/* courtesy Ian Darwin and Geoff Collyer, Softquad Inc. */
2digraph unix {
3size="6,6";
4	edge [style=bold, color=red];
5
6	"5th Edition" -> "6th Edition";
7	"5th Edition" -> "PWB 1.0";
8	"6th Edition" -> "LSX";
9	"6th Edition" -> "1 BSD";
10	"6th Edition" -> "Mini Unix";
11	"6th Edition" -> "Wollongong";
12	"6th Edition" -> "Interdata";
13	"Interdata" -> "Unix/TS 3.0";
14	"Interdata" -> "PWB 2.0";
15	"Interdata" -> "7th Edition";
16	"7th Edition" -> "8th Edition";
17	"7th Edition" -> "32V";
18	"7th Edition" -> "V7M";
19	"7th Edition" -> "Ultrix-11";
20	"7th Edition" -> "Xenix";
21	"7th Edition" -> "UniPlus+";
22	"V7M" -> "Ultrix-11";
23	"8th Edition" -> "9th Edition";
24	"1 BSD" -> "2 BSD";
25	"2 BSD" -> "2.8 BSD";
26	"2.8 BSD" -> "Ultrix-11";
27	"2.8 BSD" -> "2.9 BSD";
28	"32V" -> "3 BSD";
29	"3 BSD" -> "4 BSD";
30	"4 BSD" -> "4.1 BSD";
31	"4.1 BSD" -> "4.2 BSD";
32	"4.1 BSD" -> "2.8 BSD";
33	"4.1 BSD" -> "8th Edition";
34	"4.2 BSD" -> "4.3 BSD";
35	"4.2 BSD" -> "Ultrix-32";
36	"PWB 1.0" -> "PWB 1.2";
37	"PWB 1.0" -> "USG 1.0";
38	"PWB 1.2" -> "PWB 2.0";
39	"USG 1.0" -> "CB Unix 1";
40	"USG 1.0" -> "USG 2.0";
41	"CB Unix 1" -> "CB Unix 2";
42	"CB Unix 2" -> "CB Unix 3";
43	"CB Unix 3" -> "Unix/TS++";
44	"CB Unix 3" -> "PDP-11 Sys V";
45	"USG 2.0" -> "USG 3.0";
46	"USG 3.0" -> "Unix/TS 3.0";
47	"PWB 2.0" -> "Unix/TS 3.0";
48	"Unix/TS 1.0" -> "Unix/TS 3.0";
49	"Unix/TS 3.0" -> "TS 4.0";
50	"Unix/TS++" -> "TS 4.0";
51	"CB Unix 3" -> "TS 4.0";
52	"TS 4.0" -> "System V.0";
53	"System V.0" -> "System V.2";
54	"System V.2" -> "System V.3";
55}
56