Translate the following inference to logic notation: For all x, if x_9 were an office clerk, then x_9 is a sailor. For all x, if x_9 drives a car, then x_9 is a sailor. For all x, x_9 will drive a car. For all x, if x_9 were a nurse, then x_9 is an office clerk. Therefore Joseph is a sailor.
forall x: P(x) -> Q(x). forall x: R(x) -> Q(x). forall x: R(x). forall x: S(x) -> P(x). Therefore Q(a).