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_8. w and r_3. r <-> q_8.
w can be inferred via the simplification rule. r_3 can be inferred via the simplification rule. r -> q_8 can be inferred via the biconditional elimination rule. q_8 -> r can be inferred via the biconditional elimination rule. ~r can be inferred via the biconditional elimination rule.