What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_5: P_2(x_5). forall x_5: S(x_5) -> R(x_5). forall x_5: R(x_5) -> ~P_2(x_5). forall x_5: R(x_5) -> S(x_5).
forall x_5: ~R(x_5). forall x_5: S(x_5) <-> R(x_5). forall x_5: R(x_5) <-> S(x_5).