Translate the following inference to logic notation: For all x, if x_6 were a taxi driver, then x_6 is sad. There is at least one x for which x_6 is an artist if and only if x_6 will play squash. For all x, if x_6 were sad, then x_6 is playing squash. Therefore there is at least one x for which if x_6 were a taxi driver, then x_6 is an artist.
forall x: P(x) -> Q(x). exists x: R(x) <-> S(x). forall x: Q(x) -> S(x). Therefore exists x: P(x) -> R(x).