Translate the following inference to logic notation: For all x, if x_9 were rich, then x_9 is an artist. For all x, x_9 is rich or x_9 will take a plane. For all x, if x_9 were an artist, then x_9 is a lawyer. For all x, if x_9 takes a plane, then x_9 is an artist. For all x, if x_9 were an artist, then x_9 is taking a plane. Therefore for all x, x_9 is a lawyer.
forall x: P(x) -> Q(x). forall x: P(x) or R(x). forall x: Q(x) -> S(x). forall x: R(x) -> Q(x). forall x: Q(x) -> R(x). Therefore forall x: S(x).