What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_4: S(x_4) -> R(x_4). forall x_4: ~S_1(x_4). forall x_4: S_1(x_4) <-> S(x_4). forall x_4: R(x_4) <-> S(x_4).
forall x_4: S_1(x_4) -> S(x_4). forall x_4: R(x_4) -> S(x_4). forall x_4: S(x_4) -> S_1(x_4). forall x_4: S(x_4) -> R(x_4). forall x_4: ~S(x_4).