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_2 <-> q_9. q. ~w_2.
q and ~w_2 can be inferred via the conjunction rule. ~w_2 and q can be inferred via the conjunction rule. w_2 -> q_9 can be inferred via the biconditional elimination rule. q_9 -> w_2 can be inferred via the biconditional elimination rule. ~q_9 can be inferred via the biconditional elimination rule.