What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_4: U(x_4) or ~W_2(x_4). forall x_4: U(x_4) <-> W_2(x_4). forall x_4: ~W_2(x_4).
forall x_4: W_2(x_4) -> U(x_4). forall x_4: U(x_4) -> W_2(x_4). forall x_4: W_2(x_4) -> U(x_4). forall x_4: ~U(x_4).