Translate the following inference to logic notation: For all x, if x_5 were a taxi driver, then x_5 is an office clerk. For all x, x_5 is a taxi driver. For all x, if x_5 were an office clerk, then x_5 is a police officer. Therefore Charles is a police officer.
forall x: P(x) -> Q(x). forall x: P(x). forall x: Q(x) -> R(x). Therefore R(a).