What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? q_6 -> p_8. p_8 -> p. p_8 -> q_6. p -> p_8. ~q_6.
~p_8. q_6 -> p. p -> q_6. q_6 <-> p_8. p_8 <-> p. p_8 <-> q_6. p <-> p_8.