What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? t <-> q_9. w_3 <-> r_1. w_3 <-> t. ~q_9.
t -> q_9. w_3 -> r_1. w_3 -> t. q_9 -> t. r_1 -> w_3. t -> w_3. ~t.