Translate the following inference to logic notation: For all x, x_13 is poor or x_13 will drive a car. For all x, x_13 is an artist if and only if x_13 is a janitor. For all x, x_13 is not poor or x_13 is an artist. For all x, x_13 will drive a car if and only if x_13 is a janitor. Therefore for all x, x_13 is a janitor or x_13 is a writer.
forall x: P(x) or Q(x). forall x: R(x) <-> S(x). forall x: ~P(x) or R(x). forall x: Q(x) <-> S(x). Therefore forall x: S(x) or T(x).