What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? exists z_1: W_4(z_1) <-> Q(z_1). forall z_1: Q(z_1) -> S(z_1).
exists z_1: W_4(z_1) -> Q(z_1). exists z_1: Q(z_1) -> W_4(z_1).