What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? exists x_2: ~R(x_2). forall x_2: R(x_2) -> S_4(x_2). forall x_2: S_4(x_2) -> Q_2(x_2). forall x_2: Q_2(x_2) -> R(x_2).
exists x_2: ~Q_2(x_2). forall x_2: R(x_2) -> Q_2(x_2). forall x_2: S_4(x_2) -> R(x_2). forall x_2: Q_2(x_2) -> S_4(x_2).