Translate the following inference to logic notation: There is at least one x for which if z_3 reads a book, then z_3 is climbing a mountain. For all x, z_3 is a mechanic. For all x, if z_3 were a cashier, then z_3 is climbing a mountain. For all x, if z_3 were a mechanic, then z_3 is sad. For all x, z_3 is a cashier or z_3 will read a book. Therefore there is at least one x for which z_3 is sad and z_3 will climb a mountain.
exists x: P(x) -> Q(x). forall x: R(x). forall x: S(x) -> Q(x). forall x: R(x) -> T(x). forall x: S(x) or P(x). Therefore exists x: T(x) and Q(x).