Translate the following inference to logic notation: There is at least one x for which x_19 is not an electrician. For all x, x_19 will read a book or x_19 is a sailor. For all x, x_19 is a mechanic and x_19 is a carpenter. For all x, x_19 is an electrician if and only if x_19 will read a book. Therefore there is at least one x for which x_19 is a sailor and x_19 is a mechanic.
exists x: ~P(x). forall x: Q(x) or R(x). forall x: S(x) and T(x). forall x: P(x) <-> Q(x). Therefore exists x: R(x) and S(x).