Translate the following inference to logic notation: There is at least one x for which x_10 is a doctor. For all x, x_10 is not an electrician. For all x, x_10 is a sailor. For all x, x_10 is a sailor if and only if x_10 is an electrician. Therefore there is at least one x for which x_10 is a doctor and x_10 will drink water.
exists x: P(x). forall x: ~Q(x). forall x: R(x). forall x: R(x) <-> Q(x). Therefore exists x: P(x) and S(x).