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: r -> r_4. p -> q. r_4 -> t_4. t_4 -> w. q -> r.
r -> t_4 can be inferred via the transitivity rule. p -> r can be inferred via the transitivity rule. r_4 -> w can be inferred via the transitivity rule. q -> r_4 can be inferred via the transitivity rule.