What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? exists z: T(z) -> W_2(z). forall z: R(z) -> W_2(z). forall z: T(z) or R(z). forall z: W_2(z) -> R(z).
exists z: T(z) -> R(z). exists z: W_2(z). forall z: R(z) <-> W_2(z). forall z: W_2(z) <-> R(z).