What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? r <-> w_3. r_2 <-> p_2. ~r_2. ~r.
~r_2 and ~r. ~r and ~r_2. r -> w_3. r_2 -> p_2. w_3 -> r. p_2 -> r_2. ~w_3. ~p_2.