What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall z_1: T(z_1) -> P_2(z_1). exists z_1: W(z_1) <-> P_2(z_1). forall z_1: W(z_1) -> T(z_1).
forall z_1: W(z_1) -> P_2(z_1). exists z_1: W(z_1) -> P_2(z_1). exists z_1: P_2(z_1) -> W(z_1).