What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? p_3 <-> w_1. ~p_9 or r_7. ~p_3. p_9.
~p_3 and p_9. p_9 and ~p_3. p_3 -> w_1. w_1 -> p_3. ~w_1.