What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? p_18 or q_4. p_18 -> r. q_4 -> r. s <-> q_24. r_3. r -> q_24.
p_18 -> q_24. q_4 -> q_24. r. s -> q_24. q_24 -> s.