What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? exists z_2: W(z_2) <-> R_2(z_2). forall z_2: R_2(z_2) <-> T(z_2). forall z_2: T(z_2) <-> U(z_2). forall z_2: ~W(z_2).
forall z_2: R_2(z_2) -> T(z_2). forall z_2: T(z_2) -> U(z_2). exists z_2: W(z_2) -> R_2(z_2). forall z_2: T(z_2) -> R_2(z_2). forall z_2: U(z_2) -> T(z_2). exists z_2: R_2(z_2) -> W(z_2). exists z_2: ~R_2(z_2).