Translate the following inference to logic notation: For all x, if x_4 were happy, then x_4 is an electrician. For all x, x_4 is not an office clerk or x_4 is happy. For all x, x_4 is an electrician or x_4 is not excited. For all x, x_4 is an office clerk or x_4 is excited. Therefore for all x, x_4 is an electrician.
forall x: P(x) -> Q(x). forall x: ~R(x) or P(x). forall x: Q(x) or ~S(x). forall x: R(x) or S(x). Therefore forall x: Q(x).