Translate the following inference to logic notation: There is at least one x for which x_15 is not a musician. For all x, x_15 is an electrician. For all x, x_15 is a musician if and only if x_15 will drive a car. For all x, x_15 will drive a car or x_15 will write a letter. Therefore there is at least one x for which x_15 is an electrician and x_15 will write a letter.
exists x: ~P(x). forall x: Q(x). forall x: P(x) <-> R(x). forall x: R(x) or S(x). Therefore exists x: Q(x) and S(x).