Translate the following inference to logic notation: For all x, x_9 is not a police officer. For all x, x_9 will write a letter if and only if x_9 is curious. For all x, x_9 is a police officer. Therefore for all x, x_9 will write a letter.
forall x: ~P(x). forall x: Q(x) <-> R(x). forall x: P(x). Therefore forall x: Q(x).