Challenging exercises Jaa Sulje 1/09. Exercise 9.23 Avaa lomake 1/09. Exercise 9.24 Avaa lomake 1/09. Exercise 9.25 Avaa lomake 1/09. Exercise 9.26 Avaa lomake 1/09. Exercise 9.27 Avaa lomake 1/09. Exercise 9.28 Avaa lomake