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: p_4 -> r_8. p_13 -> q. q -> p_4. t_2 -> p_13. r_8 -> t_2.
p_4 -> t_2 can be inferred via the transitivity rule. p_13 -> p_4 can be inferred via the transitivity rule. q -> r_8 can be inferred via the transitivity rule. t_2 -> q can be inferred via the transitivity rule. r_8 -> p_13 can be inferred via the transitivity rule.