Translate the following inference to logic notation: There is at least one x for which x_13 is rich if and only if x_13 is a police officer. For all x, x_13 is rich or x_13 will read a book. For all x, if x_13 reads a book, then x_13 is a police officer. Therefore there is at least one x for which x_13 is a police officer or x_13 will take a plane.
exists x: P(x) <-> Q(x). forall x: P(x) or R(x). forall x: R(x) -> Q(x). Therefore exists x: Q(x) or S(x).