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: T_1(z) or W(z). forall z: ~T_1(z) or U(z). forall z: U(z) <-> W_4(z). forall z: W(z) -> W_4(z).
forall z: W(z) or U(z) can be inferred via the universal resolution rule. forall z: U(z) -> W_4(z) can be inferred via the universal biconditional elimination rule. forall z: W_4(z) -> U(z) can be inferred via the universal biconditional elimination rule.