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: w -> q. p_6 -> u. u -> w_2. w_2 -> w.
p_6 -> w_2 can be inferred via the transitivity rule. u -> w can be inferred via the transitivity rule. w_2 -> q can be inferred via the transitivity rule.