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) or ~W(z_1). exists z_1: S(z_1) -> P_2(z_1). forall z_1: ~P_2(z_1).
exists z_1: ~S(z_1). forall z_1: W(z_1) -> S(z_1).