digraph finite_state_machine {
	rankdir=LR;
	size="8,8"


node [fontcolor=black,color=grey,style=filled,width=1.4, height=1.0];
 	Diagrams [label="Homological \n diagrams"]
 	Abcategories [label="Abelian \n Categories"]
	Categories [label="Categories"]
	Groups [label="Groups"];
        Fpgmodules [label="FG-modules"]
        Zgmodules [label="ZG-modules"]
        Mtxmodules [label="Meat-Axe \n modules"]
        Permgroups [label="Permutation \n groups"]
        Pcgroups [label="Pc-groups"]
        Fpgroups [label="Fp-groups"]

        Diagrams -> Abcategories [color=grey]
        Abcategories -> Categories [color=grey]
        Categories -> Groups [color=grey]
        Categories -> Fpgmodules [color=grey]
        Categories -> Zgmodules [color=grey]
        Categories -> Mtxmodules [color=grey]
        Groups -> Permgroups [color=grey]
        Groups -> Pcgroups [color=grey]
        Groups -> Fpgroups  [color=grey]
	}
