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_17. w_4 -> ~q_3. u_4 <-> q_17. q_3.
~w_4 can be inferred via the modus tollens rule. ~q_17 and q_3 can be inferred via the conjunction rule. q_3 and ~q_17 can be inferred via the conjunction rule. u_4 -> q_17 can be inferred via the biconditional elimination rule. q_17 -> u_4 can be inferred via the biconditional elimination rule. ~u_4 can be inferred via the biconditional elimination rule.