What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: q or s_4. p_17 or ~s_4. r_4 -> q_1. q_1 -> p_17. r_4 or ~q.
r_4 -> p_17 can be inferred via the transitivity rule. s_4 -> p_17 can be inferred via the rewriting rule. q -> r_4 can be inferred via the rewriting rule.