What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_3: R(x_3) -> R_1(x_3). q_3 <-> R(a_15). s_1 -> q_3. ~R_1(a_15).
q_3 -> R(a_15). R(a_15) -> q_3.