What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall z_1: R(z_1) <-> R_4(z_1). ~R_4(j_2). ~r_4 -> u. r_4 -> R(j_2).
forall z_1: R(z_1) -> R_4(z_1). forall z_1: R_4(z_1) -> R(z_1).