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_6 -> w_2. p_6 or q_4. r_6 <-> q_4. w_2 -> r_6.
p_6 -> r_6 can be inferred via the transitivity rule. r_6 -> q_4 can be inferred via the biconditional elimination rule. q_4 -> r_6 can be inferred via the biconditional elimination rule.