Translate the following inference to logic notation: For all x, x_6 is a cashier or x_6 is not a taxi driver. For all x, if x_6 climbs a mountain, then x_6 is a taxi driver. For all x, x_6 will climb a mountain. Therefore for all x, x_6 is a cashier.
forall x: P(x) or ~Q(x). forall x: R(x) -> Q(x). forall x: R(x). Therefore forall x: P(x).