(Forall (?Self ?Time)
(<=> (Active ?Time 2-Output-Control-Volume ?Self)
(And (2-Output-Control-Volume ?Self)
(Active ?Time Control-Volume ?Self))))
(Attribute-Function-Of Outlet-Stream1 2-Output-Control-Volume)
(Attribute-Function-Of Outlet-Stream2 2-Output-Control-Volume)
(Forall (?Self ?Time)
(<=> (Active ?Time 1-2-Control-Volume ?Self)
(And (1-2-Control-Volume ?Self)
(Active ?Time 1-Input-Control-Volume ?Self)
(Active ?Time 2-Output-Control-Volume ?Self))))
(Forall (?Self ?Time)
(<=> (Active ?Time 2-2-Control-Volume ?Self)
(And (2-2-Control-Volume ?Self)
(Active ?Time 2-Input-Control-Volume ?Self)
(Active ?Time 2-Output-Control-Volume ?Self))))