the runway at kumlinge airfield that has a width less than or equal to18.0, is made out of what surface?
(AND aviation.airport_runway_surface (JOIN aviation.airport_runway_surface.runways (AND (ge aviation.airport_runway.width 18.0^^http://www.w3.org/2001/XMLSchema#float) (JOIN aviation.airport_runway.airport m.09rvzq0))))