Translate the following inference to logic notation: For all x, x_10 is a soldier or x_10 is not a sailor. There is at least one x for which x_10 is a sailor and x_10 is happy. Therefore there is at least one x for which x_10 is a soldier.
forall x: P(x) or ~Q(x). exists x: Q(x) and R(x). Therefore exists x: P(x).