What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_12: R(x_12) <-> Q_12(x_12). forall x_12: Q_4(x_12). forall x_12: Q_12(x_12) -> R(x_12). exists x_12: Q_12(x_12) -> ~Q_4(x_12).
exists x_12: ~Q_12(x_12). forall x_12: R(x_12) -> Q_12(x_12). forall x_12: Q_12(x_12) -> R(x_12).