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). exists y: R(y) <-> W(y). forall y: W(y).
forall y: S(y) and W(y). forall y: W(y) and S(y). exists y: R(y) -> W(y). exists y: W(y) -> R(y).