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_1: ~S(z_1). forall z_1: W_3(z_1) -> U(z_1). forall z_1: U(z_1) -> S(z_1). forall z_1: S(z_1) -> W_3(z_1).
forall z_1: ~U(z_1) can be inferred via the universal modus tollens rule. forall z_1: W_3(z_1) -> S(z_1) can be inferred via the universal transitivity rule. forall z_1: U(z_1) -> W_3(z_1) can be inferred via the universal transitivity rule. forall z_1: S(z_1) -> U(z_1) can be inferred via the universal transitivity rule.