What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall y: S(y) or ~W_1(y). forall y: S(y) -> W_1(y). forall y: W_1(y) -> S(y).
forall y: W_1(y) -> S(y). forall y: S(y) <-> W_1(y). forall y: W_1(y) <-> S(y).