Translate the following inference to logic notation: For all x, x_11 is an office clerk. For all x, x_11 will drink water if and only if x_11 will play squash. For all x, x_11 will drink water or x_11 is a doctor. For all x, x_11 will not play squash. Therefore Sarah is a doctor.
forall x: P(x). forall x: Q(x) <-> R(x). forall x: Q(x) or S(x). forall x: ~R(x). Therefore S(a).