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). forall y: S(y) or ~W_4(y). exists y: S_4(y).
exists y: S_4(y) and W_4(y). exists y: W_4(y) and S_4(y). forall y: W_4(y) -> S(y).