Translate the following inference to logic notation: For all x, if x_13 were a writer, then x_13 is taking a plane. For all x, if x_13 were rich, then x_13 is a writer. For all x, x_13 is rich if and only if x_13 will take a plane. For all x, if x_13 were a writer, then x_13 is reading a book. Therefore for all x, if x_13 takes a plane, then x_13 is reading a book.
forall x: P(x) -> Q(x). forall x: R(x) -> P(x). forall x: R(x) <-> Q(x). forall x: P(x) -> S(x). Therefore forall x: Q(x) -> S(x).