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: P_3(z) -> R(z). forall z: W(z) or P_3(z). exists z: W(z) -> S_4(z). forall z: R(z) -> T_2(z). forall z: T_2(z) <-> S_4(z).
forall z: P_3(z) -> T_2(z) can be inferred via the universal transitivity rule. forall z: T_2(z) -> S_4(z) can be inferred via the universal biconditional elimination rule. forall z: S_4(z) -> T_2(z) can be inferred via the universal biconditional elimination rule.