What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall z: U(z) <-> Q_2(z). forall z: U(z) -> P(z). forall z: ~P(z). forall z: P(z) -> U(z). forall z: P(z) -> U(z).
forall z: ~U(z). forall z: U(z) <-> P(z). forall z: U(z) <-> P(z). forall z: P(z) <-> U(z). forall z: P(z) <-> U(z). forall z: U(z) -> Q_2(z). forall z: Q_2(z) -> U(z).