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: T_4(a_5) <-> t_2. forall x: T_4(x) -> Q_2(x). forall x: ~Q_2(x).
T_4(a_5) -> t_2 can be inferred via the biconditional elimination rule. t_2 -> T_4(a_5) can be inferred via the biconditional elimination rule. forall x: ~T_4(x) can be inferred via the universal modus tollens rule.