What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_3: W_4(x_3) or ~U(x_3). exists x_3: ~U(x_3). forall x_3: U(x_3) or ~W_4(x_3).
forall x_3: U(x_3) -> W_4(x_3). forall x_3: W_4(x_3) -> U(x_3).