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_2(z_1) -> T_4(z_1). exists z_1: T(z_1) <-> T_4(z_1). forall z_1: ~S_2(z_1). forall z_1: S_2(z_1) or ~T_4(z_1).
forall z_1: T_4(z_1) -> S_2(z_1) can be inferred via the universal rewriting rule. exists z_1: T(z_1) -> T_4(z_1) can be inferred via the existential biconditional elimination rule. exists z_1: T_4(z_1) -> T(z_1) can be inferred via the existential biconditional elimination rule.