What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? ~w_2. ~u. t <-> u. w_2 <-> q_9.
~w_2 and ~u. ~u and ~w_2. t -> u. w_2 -> q_9. u -> t. q_9 -> w_2. ~q_9. ~t.