Translate the following inference to logic notation: For all x, x_15 will write a letter if and only if x_15 will drink water. For all x, x_15 will write a letter or x_15 will not play tennis. For all x, x_15 will play tennis. Therefore for all x, x_15 will drink water or x_15 is a bartender.
forall x: P(x) <-> Q(x). forall x: P(x) or ~R(x). forall x: R(x). Therefore forall x: Q(x) or S(x).