Translate the following inference to logic notation: For all x, if x_13 were a doctor, then x_13 is playing a game. For all x, if x_13 plays squash, then x_13 is driving a car. For all x, x_13 will play a game if and only if x_13 is a sailor. For all x, x_13 is an electrician or x_13 is a doctor. For all x, if x_13 drives a car, then x_13 is a sailor. For all x, x_13 is not an electrician or x_13 will play squash. Therefore for all x, x_13 is a sailor.
forall x: P(x) -> Q(x). forall x: R(x) -> S(x). forall x: Q(x) <-> T(x). forall x: U(x) or P(x). forall x: S(x) -> T(x). forall x: ~U(x) or R(x). Therefore forall x: T(x).