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: U_4(z) -> S_3(z). forall z: T_3(z) -> U_4(z). exists z: T(z) or T_3(z). forall z: T(z) -> U_4(z).
forall z: T_3(z) -> S_3(z) can be inferred via the universal transitivity rule. forall z: T(z) -> S_3(z) can be inferred via the universal transitivity rule. exists z: U_4(z) can be inferred via the existential disjunction elimination rule.