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: t -> r. u -> w. s -> u. r -> s. q -> t.
t -> s can be inferred via the transitivity rule. s -> w can be inferred via the transitivity rule. r -> u can be inferred via the transitivity rule. q -> r can be inferred via the transitivity rule.