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 -> p. r_4. r_4 -> t_3. t_3 -> q.
t_3 can be inferred via the modus ponens rule. r_4 -> q can be inferred via the transitivity rule. t_3 -> p can be inferred via the transitivity rule.