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_12 -> p_2. ~p. p_2 -> s. s -> p. p -> q_12.
~s can be inferred via the modus tollens rule. q_12 -> s can be inferred via the transitivity rule. p_2 -> p can be inferred via the transitivity rule. s -> q_12 can be inferred via the transitivity rule. p -> p_2 can be inferred via the transitivity rule.