What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_9: R_4(x_9) -> T_1(x_9). forall x_9: T_1(x_9) -> R_4(x_9). forall x_9: T_1(x_9). exists x_9: R_2(x_9).
forall x_9: R_4(x_9). exists x_9: R_2(x_9) and T_1(x_9). exists x_9: T_1(x_9) and R_2(x_9). forall x_9: R_4(x_9) <-> T_1(x_9). forall x_9: T_1(x_9) <-> R_4(x_9).