Translate the following inference to logic notation: There is at least one x for which if x_9 were an electrician, then x_9 is reading a book. For all x, x_9 will climb a mountain. For all x, x_9 will read a book if and only if x_9 is an astronaut. For all x, if x_9 climbs a mountain, then x_9 is an astronaut. Therefore there is at least one x for which x_9 will read a book.
exists x: P(x) -> Q(x). forall x: R(x). forall x: Q(x) <-> S(x). forall x: R(x) -> S(x). Therefore exists x: Q(x).