What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_13: U(x_13). forall x_13: Q_4(x_13) <-> T_3(x_13). exists x_13: T_3(x_13).
exists x_13: T_3(x_13) and U(x_13). exists x_13: U(x_13) and T_3(x_13). forall x_13: Q_4(x_13) -> T_3(x_13). forall x_13: T_3(x_13) -> Q_4(x_13).