(Forall (?Self ?Time)
(<=> (Active ?Time 2-Input-Control-Volume ?Self)
(And (2-Input-Control-Volume ?Self)
(Active ?Time Control-Volume ?Self))))
(Attribute-Function-Of Inlet-Stream1 2-Input-Control-Volume)
(Attribute-Function-Of Inlet-Stream2 2-Input-Control-Volume)
(Forall (?Self ?Time)
(<=> (Active ?Time 3-Input-Control-Volume ?Self)
(And (3-Input-Control-Volume ?Self)
(Active ?Time 2-Input-Control-Volume ?Self))))
(Forall (?Self ?Time)
(<=> (Active ?Time 2-1-Control-Volume ?Self)
(And (2-1-Control-Volume ?Self)
(Active ?Time 2-Input-Control-Volume ?Self)
(Active ?Time 1-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))))