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 -> t_1. r_8 -> u. t_1 -> r_8. ~u. r_8 -> q.
~r_8 can be inferred via the modus tollens rule. q -> r_8 can be inferred via the transitivity rule. t_1 -> u can be inferred via the transitivity rule. t_1 -> q can be inferred via the transitivity rule. r_8 -> t_1 can be inferred via the transitivity rule.