What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? u_2 -> ~q_18. q_14 -> p_10. r. u_2 <-> q_14. q_18. p_10 -> q_14.
~u_2. r and q_18. q_18 and r. q_14 <-> p_10. p_10 <-> q_14. u_2 -> q_14. q_14 -> u_2.