Translate the following inference to logic notation: For all x, x_16 will sleep if and only if x_16 is a lawyer. For all x, x_16 will sleep or x_16 will not drink water. David is drinking water. Therefore David is a lawyer.
forall x: P(x) <-> Q(x). forall x: P(x) or ~R(x). R(a). Therefore Q(a).