Translate the following inference to logic notation: For all x, x_6 is an electrician or x_6 is a doctor. For all x, x_6 will write a letter. For all x, if x_6 were an electrician, then x_6 is not writing a letter. For all x, if x_6 were a doctor, then x_6 is a server. Therefore for all x, x_6 is a server.
forall x: P(x) or Q(x). forall x: R(x). forall x: P(x) -> ~R(x). forall x: Q(x) -> S(x). Therefore forall x: S(x).