What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? ~q. p -> ~u. u_3 <-> q_7. u_3 <-> q. u.
~p. ~q and u. u and ~q. u_3 -> q_7. u_3 -> q. q_7 -> u_3. q -> u_3. ~u_3.