Translate the following inference to logic notation: For all x, x_7 will drink water or x_7 will not play squash. There is at least one x for which x_7 will listen to a song. For all x, if x_7 listens to a song, then x_7 is playing squash. Therefore there is at least one x for which x_7 will drink water.
forall x: P(x) or ~Q(x). exists x: R(x). forall x: R(x) -> Q(x). Therefore exists x: P(x).