Translate the following inference to logic notation: For all x, if x_4 cooks, then x_4 is playing squash. For all x, if x_4 plays squash, then x_4 is reading a book. For all x, if x_4 were a sailor, then x_4 is playing squash. For all x, x_4 will cook or x_4 is a sailor. Therefore for all x, x_4 will read a book.
forall x: P(x) -> Q(x). forall x: Q(x) -> R(x). forall x: S(x) -> Q(x). forall x: P(x) or S(x). Therefore forall x: R(x).