What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? q_4 or q. r_3 <-> q. ~q_4 or r_12. r_12 <-> r_3.
q or r_12. r_3 -> q. r_12 -> r_3. q -> r_3. r_3 -> r_12.