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