Chart for systems of dispersion (_Archaeology..._)

Foucault describes "systems of dispersion" of statements in Ch. 2,
p. 33-35, _The Archaeology of Knowledge_.

SOME OF US LEARN VISUALLY...
One woman in my class came up with a chart for this.  See if you
can add to it. Would appreciate help and corrections...

She says,

Consider

     the hub of a wheel = the four items he investigates
          (objects, types of statements, concepts, thematic choices)

     the spokes = relationships (Is this precise enough?)
  
     common spokes between differing wheels = regularities or
                                              discusive formations

     conditions where common spokes are formed = rules of formation

     How's this? Has she got the flow chart right?

     WE WOULD APPRECIATE any more charts that map what Foucault is saying
in _Archaeology..._.  We are having to read two Foucault books so
quickly that it is very much to absorb, and I for one, am a visual
learner, so it would help me if ppl could could up with visual guides
to what goes with what.  Thanks!

                                   Gloria