What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_4: W_3(x_4). forall x_4: U(x_4) -> ~W_3(x_4). forall x_4: R(x_4) or ~P_2(x_4). exists x_4: U(x_4) <-> R(x_4). forall x_4: R(x_4) -> P_2(x_4).
forall x_4: ~U(x_4). forall x_4: P_2(x_4) -> R(x_4). exists x_4: U(x_4) -> R(x_4). exists x_4: R(x_4) -> U(x_4).