What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_2: U(x_2) -> Q_3(x_2). forall x_2: U(x_2) -> Q_3(x_2). exists x_2: Q_3(x_2) -> U(x_2). forall x_2: ~U(x_2).
exists x_2: ~Q_3(x_2). exists x_2: Q_3(x_2) <-> U(x_2). exists x_2: Q_3(x_2) <-> U(x_2). exists x_2: U(x_2) <-> Q_3(x_2). exists x_2: U(x_2) <-> Q_3(x_2).