Translate the following inference to logic notation: There is at least one x for which x_18 is happy if and only if x_18 will drive a car. For all x, if x_18 were a musician, then x_18 is driving a car. For all x, x_18 will drink water or x_18 is happy. For all x, x_18 will not drink water or x_18 is a musician. For all x, x_18 will sleep. Therefore there is at least one x for which x_18 will drive a car.
exists x: P(x) <-> Q(x). forall x: R(x) -> Q(x). forall x: S(x) or P(x). forall x: ~S(x) or R(x). forall x: T(x). Therefore exists x: Q(x).