What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? r_4 -> r_22. r_22 -> q_15. r_4 or q_22. q_15 -> r_22. w_1. q_22 -> r_22.
r_4 -> q_15. q_22 -> q_15. r_22. r_22 <-> q_15. q_15 <-> r_22.