What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? w_3 <-> t_3. r <-> q_3. q_3 -> p_6. p_6 -> t_3. ~w_3.
q_3 -> t_3. w_3 -> t_3. r -> q_3. t_3 -> w_3. q_3 -> r. ~t_3.