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_4 -> r_3. r_3 -> s. s -> s_4.
s_4 -> s can be inferred via the transitivity rule. r_3 -> s_4 can be inferred via the transitivity rule. s -> r_3 can be inferred via the transitivity rule.