What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall z_1: S(z_1) <-> Q(z_1). forall z_1: S(z_1) -> Q(z_1). ~Q(e).
forall z_1: S(z_1) -> Q(z_1). forall z_1: Q(z_1) -> S(z_1).