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: S_2(z). exists z: T(z) -> ~T_2(z). forall z: T(z) <-> Q_2(z). forall z: S_2(z) -> T_2(z).
forall z: T_2(z) can be inferred via the universal modus ponens rule. forall z: T(z) -> Q_2(z) can be inferred via the universal biconditional elimination rule. forall z: Q_2(z) -> T(z) can be inferred via the universal biconditional elimination rule.