Translate the following inference to logic notation: For all x, x_9 will not take a plane. Charles is a soldier if and only if Patricia is driving a car. For all x, x_9 is a soldier if and only if x_9 will take a plane. Therefore Patricia is not driving a car.
forall x: ~P(x). Q(a) <-> p. forall x: Q(x) <-> P(x). Therefore ~p.