Translate the following inference to logic notation: For all x, x_10 is an office clerk. For all x, if x_10 were an office clerk, then x_10 is reading a book. For all x, if x_10 reads a book, then x_10 is an office clerk. Therefore Joseph is reading a book.
forall x: P(x). forall x: P(x) -> Q(x). forall x: Q(x) -> P(x). Therefore Q(a).