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 y_3: Q(y_3) <-> T_2(y_3). exists y_3: T_2(y_3) or T_1(y_3). forall y_3: T_4(y_3) -> Q(y_3). forall y_3: T_1(y_3) -> T_4(y_3).
forall y_3: T_1(y_3) -> Q(y_3) can be inferred via the universal transitivity rule. forall y_3: Q(y_3) -> T_2(y_3) can be inferred via the universal biconditional elimination rule. forall y_3: T_2(y_3) -> Q(y_3) can be inferred via the universal biconditional elimination rule.