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 <-> q. forall x_9: P_9(x_9). ~q.
w -> q can be inferred via the biconditional elimination rule. q -> w can be inferred via the biconditional elimination rule. ~w can be inferred via the biconditional elimination rule.