digraph float {
    node [shape = circle, height = 0.6, fontname = "monospace", fixedsize = true, fontsize = 12];
    edge [fontname = "monospace", fontsize = 12];
    
    node [shape = circle];
        START; D; P; DE; DES;

    node [style = filled];
        DP PD DED PDF DPL;
    
    // node [shape = circle, fixedsize = true];
        START -> D [ label = "[0-9]" ];
        START -> P [ label = ".(dot)" ];
        
        D -> DE [ label = "[Ee]" ];
        D -> D [ label = "[0-9]" ];
        D -> DP [ label = ".(dot)" ];
        
        P -> PD [ label = "[0-9]" ];

        DP -> DE [ label = "[Ee]" ];
        DP -> PDF [ label = "[Ff]" ];
        DP -> PD [ label = "[0-9]" ];
        DP -> DPL [ label = "[Ll]" ];

        PD -> PD [ label = "[0-9]" ];
        PD -> PDF [ label = "[Ff]" ];
        PD -> DE [ label = "[Ee]" ];
        PD -> DPL [ label = "[Ll]" ];

        DE -> DES [ label = "[+-]" ];
        DE -> DED [ label = "[0-9]" ];

        DES -> DED [ label = "[0-9]" ];

        DED -> DED [ label = "[0-9]" ];
        DED -> PDF [ label = "[Ff]" ];
        DED -> DPL [ label = "[Ll]" ];

}