What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? exists x: S_3(x). forall x: S_3(x) <-> S_1(x). forall x: W_2(x) -> S_1(x).
forall x: S_3(x) -> S_1(x). forall x: S_1(x) -> S_3(x).