Translate the following inference to logic notation: There is at least one x for which x_5 will work or x_5 is not a sailor. For all x, if x_5 works, then x_5 is a sailor. For all x, x_5 will not work. Therefore there is at least one x for which x_5 is not a sailor.
exists x: P(x) or ~Q(x). forall x: P(x) -> Q(x). forall x: ~P(x). Therefore exists x: ~Q(x).