Translate the following inference to logic notation: For all x, if x_1 drinks water, then x_1 is a writer. For all x, if x_1 were a writer, then x_1 is drinking water. For all x, x_1 will not drink water. Therefore for all x, x_1 is not a writer.
forall x: P(x) -> Q(x). forall x: Q(x) -> P(x). forall x: ~P(x). Therefore forall x: ~Q(x).