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: forall z_4: Q_2(z_4) <-> T(z_4). exists z_4: S(z_4) -> Q_2(z_4). forall z_4: T(z_4) -> S(z_4).
exists z_4: T(z_4) -> Q_2(z_4) can be inferred via the existential transitivity rule. forall z_4: Q_2(z_4) -> T(z_4) can be inferred via the universal biconditional elimination rule. forall z_4: T(z_4) -> Q_2(z_4) can be inferred via the universal biconditional elimination rule.