Translate the following inference to logic notation: For all x, x_13 is an artist or x_13 will not write a letter. There is at least one x for which x_13 will write a letter. For all x, x_13 will drink water. Therefore there is at least one x for which x_13 is an artist.
forall x: P(x) or ~Q(x). exists x: Q(x). forall x: R(x). Therefore exists x: P(x).