the class of operating mode models of air
the air involved
(Forall (?Self ?Air-Involved)
(<=> (And (= (Air-Involved ?Self) ?Air-Involved)
(Air-Operating-Mode ?Self))
(And (Operating-Mode-Model ?Self) (Air ?Air-Involved))))
(Forall (?Self ?Time)
(<=> (Active ?Time Air-Operating-Mode ?Self)
(And (Air-Operating-Mode ?Self)
(Active ?Time Operating-Mode-Model ?Self))))