Translate the following inference to logic notation: There is at least one x for which if x_10 were an artist, then x_10 is a sailor. For all x, x_10 is not an artist. For all x, if x_10 were a sailor, then x_10 is an artist. For all x, x_10 is a sailor or x_10 will write a letter. Therefore there is at least one x for which x_10 will write a letter.
exists x: P(x) -> Q(x). forall x: ~P(x). forall x: Q(x) -> P(x). forall x: Q(x) or R(x). Therefore exists x: R(x).