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 -> r_1. p_11 -> q_11. q_11 -> s_2. p_11 or ~s.
p_11 -> s_2 can be inferred via the transitivity rule. q_11 -> r_1 can be inferred via the transitivity rule. s -> p_11 can be inferred via the rewriting rule.