neyric/wireit

digraph unix {
    "5thEdition" -> "6thEdition" ;
    "5thEdition" -> "PWB1.0" ;
    "6thEdition" -> "LSX" ;
    "6thEdition" -> "1BSD" ;
    "6thEdition" -> "MiniUnix" ;
    "6thEdition" -> "Wollongong" ;
    "6thEdition" -> "Interdata" ;
    "Interdata" -> "Unix/TS3.0" ;
    "Interdata" -> "PWB2.0" ;
    "Interdata" -> "7thEdition" ;
    "7thEdition" -> "8thEdition" ;
    "7thEdition" -> "32V" ;
    "7thEdition" -> "V7M" ;
    "7thEdition" -> "Ultrix-11" ;
    "7thEdition" -> "Xenix" ;
    "7thEdition" -> "UniPlus+" ;
    "V7M" -> "Ultrix-11" ;
    "8thEdition" -> "9thEdition" ;
    "1BSD" -> "2BSD" ;
    "2BSD" -> "2.8BSD" ;
    "2.8BSD" -> "Ultrix-11" ;
    "2.8BSD" -> "2.9BSD" ;
    "32V" -> "3BSD" ;
    "3BSD" -> "4BSD" ;
    "4BSD" -> "4.1BSD" ;
    "4.1BSD" -> "4.2BSD" ;
    "4.1BSD" -> "2.8BSD" ;
    "4.1BSD" -> "8thEdition" ;
    "4.2BSD" -> "4.3BSD" ;
    "4.2BSD" -> "Ultrix-32" ;
    "PWB1.0" -> "PWB1.2" ;
    "PWB1.0" -> "USG1.0" ;
    "PWB1.2" -> "PWB2.0" ;
    "USG1.0" -> "CB Unix1" ;
    "USG1.0" -> "USG2.0" ;
    "CB Unix1" -> "CB Unix2" ;
    "CB Unix2" -> "CB Unix3" ;
    "CB Unix3" -> "Unix/TS++" ;
    "CB Unix3" -> "PDP-11 SysV" ;
    "USG2.0" -> "USG3.0" ;
    "USG3.0" -> "Unix/TS3.0" ;
    "PWB2.0" -> "Unix/TS3.0" ;
    "Unix/TS1.0" -> "Unix/TS3.0" ;
    "Unix/TS3.0" -> "TS4.0" ;
    "Unix/TS++" -> "TS4.0" ;
    "CB Unix3" -> "TS4.0" ;
    "TS4.0" -> "SystemV.0" ;
    "SystemV.0" -> "SystemV.2" ;
    "SystemV.2" -> "SystemV.3" ;
}