Translate the following inference to logic notation: There is at least one x for which x_6 will listen to a song and x_6 is sad. For all x, if x_6 listens to a song, then x_6 is playing squash. Therefore there is at least one x for which x_6 will play squash.
exists x: P(x) and Q(x). forall x: P(x) -> R(x). Therefore exists x: R(x).