4.4 Dolphins 3

Code

graph TD;
    bottom["Length=[3,4] & Gills=no & Beak=yes"];
    A["Length=[3,4] & Gills=no"];
    B["Length=[3,4] & Beak=yes"];
    C["Gills=no & Beak=yes"];
    AB["Length=[3,4]"];
    AC["Gills=no"];
    BC["Beak=yes"];

    A --> bottom;
    B --> bottom;
    C --> bottom;
    AB --> A;
    AB --> B;
    AC --> A;
    AC --> C;
    BC --> B;
    BC --> C;

graph TD;
    bottom["Length=[3,4] & Gills=no & Beak=yes"];
    A["Length=[3,4] & Gills=no"];
    B["Length=[3,4] & Beak=yes"];
    C["Gills=no & Beak=yes"];
    AB["Length=[3,4]"];
    AC["Gills=no"];
    BC["Beak=yes"];

    A --> bottom;
    B --> bottom;
    C --> bottom;
    AB --> A;
    AB --> B;
    AC --> A;
    AC --> C;
    BC --> B;
    BC --> C;