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: u -> q_1. q -> p_6. t -> u. p_6 -> t.
q -> t can be inferred via the transitivity rule. t -> q_1 can be inferred via the transitivity rule. p_6 -> u can be inferred via the transitivity rule.