Translate the following inference to logic notation: For all x, if x_5 drinks water, then x_5 is an electrician. For all x, x_5 will drink water or x_5 is not an electrician. Therefore if Mary were an electrician, then Mary is drinking water.
forall x: P(x) -> Q(x). forall x: P(x) or ~Q(x). Therefore Q(a) -> P(a).