What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? p_8 <-> q_3. forall x_13: R_13(x_13) or S_13(x_13). ~p_8. R_13(a_13) -> q_3.
p_8 -> q_3. q_3 -> p_8. ~q_3.