What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall z_2: P_4(z_2) <-> R_1(z_2). forall z_2: ~R_1(z_2).
forall z_2: P_4(z_2) -> R_1(z_2). forall z_2: R_1(z_2) -> P_4(z_2). forall z_2: ~P_4(z_2).