Translate the following inference to logic notation: For all x, x_9 is a musician if and only if x_9 will sleep. For all x, x_9 will not sleep or x_9 is fast. For all x, x_9 is a musician. Therefore for all x, x_9 will listen to a song or x_9 is fast.
forall x: P(x) <-> Q(x). forall x: ~Q(x) or R(x). forall x: P(x). Therefore forall x: S(x) or R(x).