What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? ~p_13. p_13 <-> q_13. q_8 or ~p_2. q_13 <-> q_8.
p_2 -> q_8. p_13 -> q_13. q_13 -> q_8. q_13 -> p_13. q_8 -> q_13. ~q_13.