What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x: Q(x) or ~U_1(x). forall x: U_1(x) or U(x). forall x: U(x) <-> Q(x).
forall x: U_1(x) -> Q(x). forall x: U(x) -> Q(x). forall x: Q(x) -> U(x).