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: s_2 or w. w_4 -> r. q_3 or ~s_2. q_3 -> w_4. w -> r.
q_3 -> r can be inferred via the transitivity rule. s_2 -> q_3 can be inferred via the rewriting rule.