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: p_4 -> r_8. r_8 -> w. q -> p_4. w -> q.
p_4 -> w can be inferred via the transitivity rule. r_8 -> q can be inferred via the transitivity rule. q -> r_8 can be inferred via the transitivity rule. w -> p_4 can be inferred via the transitivity rule.