What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? u and q_17. w_2 -> q_11. w_2 <-> w. q_11 -> w_2. q_11 -> ~u.
w_2 -> ~u. u. q_17. w_2 <-> q_11. q_11 <-> w_2. w_2 -> w. w -> w_2.