the control volume with two input streams
(Forall (?Self ?Time) (<=> (Active ?Time 2-Input-Control-Volume ?Self) (And (2-Input-Control-Volume ?Self) (Active ?Time Control-Volume ?Self))))
(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))))