What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? r -> W(a). forall x_3: S(x_3) -> W(x_3). r or S(a). forall x_3: W(x_3) -> S(x_3).
R_1(a) -> r. forall x_3: S(x_3) <-> W(x_3). forall x_3: W(x_3) <-> S(x_3).