What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x: T_2(x) -> P_4(x). exists x: T_2(x) -> W(x). forall x: P_4(x) -> T_2(x).
exists x: P_4(x) -> W(x). forall x: T_2(x) <-> P_4(x). forall x: P_4(x) <-> T_2(x).