what type of surface is used by the runway at farmville regional airport with the width less than or equal to 23.0?
(AND aviation.airport_runway_surface (JOIN aviation.airport_runway_surface.runways (AND (ge aviation.airport_runway.width 23.0^^http://www.w3.org/2001/XMLSchema#float) (JOIN aviation.airport_runway.airport m.0458xp_))))