What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall y: W_4(y) <-> S(y). forall y: S(y) -> W_4(y). forall y: ~W_4(y).
forall y: ~S(y). forall y: W_4(y) -> S(y). forall y: S(y) -> W_4(y). forall y: ~S(y).