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