Translate the following inference to logic notation: For all x, x_6 is an artist if and only if x_6 is an electrician. For all x, x_6 is an electrician if and only if x_6 is a lawyer. There is at least one x for which x_6 is not an artist. Therefore there is at least one x for which x_6 is not a lawyer.
forall x: P(x) <-> Q(x). forall x: Q(x) <-> R(x). exists x: ~P(x). Therefore exists x: ~R(x).