Translate the following inference to logic notation: For all x, x_11 will read a book if and only if x_11 is a taxi driver. For all x, if x_11 drives a car, then x_11 is a taxi driver. There is at least one x for which if x_11 reads a book, then x_11 is a taxi driver. Therefore there is at least one x for which if x_11 drives a car, then x_11 is reading a book.
forall x: P(x) <-> Q(x). forall x: R(x) -> Q(x). exists x: P(x) -> Q(x). Therefore exists x: R(x) -> P(x).