Translate the following inference to logic notation: For all x, if x_10 were a cashier, then x is playing a game. For all x, if x_10 reads a book, then x is playing a game. For all x, if x plays a game, then x is a writer. For all x, x_10 will read a book or x_10 is a cashier. Therefore David is a writer.
forall x: P(x) -> Q(x). forall x: R(x) -> Q(x). forall x: Q(x) -> S(x). forall x: R(x) or P(x). Therefore S(a).