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: ~u. w -> ~q. q. u <-> q_16. p_4 -> w.
~w can be inferred via the modus tollens rule. ~u and q can be inferred via the conjunction rule. q and ~u can be inferred via the conjunction rule. u -> q_16 can be inferred via the biconditional elimination rule. q_16 -> u can be inferred via the biconditional elimination rule. ~q_16 can be inferred via the biconditional elimination rule.