Translate the following inference to logic notation: For all x, x_4 is a taxi driver or x_4 will take a plane. For all x, if x_4 takes a plane, then x_4 is a bartender. For all x, if x_4 were a bartender, then x_4 is excited. For all x, if x_4 were a taxi driver, then x_4 is a bartender. Therefore for all x, x_4 is excited.
forall x: P(x) or Q(x). forall x: Q(x) -> R(x). forall x: R(x) -> S(x). forall x: P(x) -> R(x). Therefore forall x: S(x).