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_2: S_3(z_2) <-> U_1(z_2). exists z_2: T_2(z_2) <-> U_1(z_2). forall z_2: ~Q(z_2) or U(z_2). forall z_2: ~S_3(z_2). forall z_2: Q(z_2) or T_2(z_2).
forall z_2: T_2(z_2) or U(z_2) can be inferred via the universal resolution rule. forall z_2: S_3(z_2) -> U_1(z_2) can be inferred via the universal biconditional elimination rule. exists z_2: T_2(z_2) -> U_1(z_2) can be inferred via the existential biconditional elimination rule. forall z_2: U_1(z_2) -> S_3(z_2) can be inferred via the universal biconditional elimination rule. exists z_2: U_1(z_2) -> T_2(z_2) can be inferred via the existential biconditional elimination rule. forall z_2: ~U_1(z_2) can be inferred via the universal biconditional elimination rule.