What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? q_11 -> p_11. q_11 <-> p_6. p_6 -> q_6. ~q_6. p_11 -> q_11.
~p_6. q_11 <-> p_11. p_11 <-> q_11. q_11 -> p_6. p_6 -> q_11.