What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? p_7 <-> p_1. ~q. ~p_7. q_2 -> q.
~q_2. ~q and ~p_7. ~p_7 and ~q. p_7 -> p_1. p_1 -> p_7. ~p_1.