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_2 -> p_8. p_8 <-> w. q -> q_2.
q -> p_8 can be inferred via the transitivity rule. p_8 -> w can be inferred via the biconditional elimination rule. w -> p_8 can be inferred via the biconditional elimination rule.