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_5 <-> q. ~p_5. w or ~q. w -> q.
q -> w can be inferred via the rewriting rule. p_5 -> q can be inferred via the biconditional elimination rule. q -> p_5 can be inferred via the biconditional elimination rule. ~q can be inferred via the biconditional elimination rule.