What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? exists x_2: T_2(x_2) -> P_4(x_2). forall x_2: P_4(x_2) -> T_2(x_2).
exists x_2: T_2(x_2) <-> P_4(x_2). exists x_2: P_4(x_2) <-> T_2(x_2).