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: exists z: W_4(z) -> R(z). forall z: R(z) -> S_1(z). forall z: S_1(z) -> W_4(z).
forall z: R(z) -> W_4(z) can be inferred via the universal transitivity rule. exists z: W_4(z) -> S_1(z) can be inferred via the existential transitivity rule. exists z: S_1(z) -> R(z) can be inferred via the existential transitivity rule.