Translate the following inference to logic notation: For all x, x_6 is sad. For all x, x_6 is a soldier. For all x, if x_6 were a cashier, then x_6 is taking a plane. For all x, x_6 is a cashier. Therefore for all x, x_6 will take a plane and x_6 is sad.
forall x: P(x). forall x: Q(x). forall x: R(x) -> S(x). forall x: R(x). Therefore forall x: S(x) and P(x).