What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? exists y: W_1(y) <-> S(y). forall y: Q_4(y). forall y: S(y) -> ~Q_4(y).
forall y: ~S(y). exists y: W_1(y) -> S(y). exists y: S(y) -> W_1(y).