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) or ~R(z). forall z: T(z) <-> Q_4(z). forall z: Q_4(z) -> R(z).
exists z: R(z) -> T(z). forall z: T(z) -> Q_4(z). forall z: Q_4(z) -> T(z).