Challenging exercises Jaa Sulje 2/12. Exercise 12.24 Avaa lomake 2/12. Exercise 12.25 Avaa lomake 2/12. Exercise 12.26 Avaa lomake 2/12. Exercise 12.27 Avaa lomake 2/12. Exercise 12.28 Avaa lomake 2/12. Exercise 12.29 Avaa lomake 2/12. Exercise 12.30 Avaa lomake