Translate the following inference to logic notation: For all x, if z were an electrician, then z is writing a letter. For all x, if z were an electrician, then z is driving a car. For all x, if z writes a letter, then z is an electrician. For all x, if z drives a car, then z is an electrician. For all x, z will not write a letter. Therefore for all x, z will not drive a car.
forall x: P(x) -> Q(x). forall x: P(x) -> R(x). forall x: Q(x) -> P(x). forall x: R(x) -> P(x). forall x: ~Q(x). Therefore forall x: ~R(x).