Challenging exercises Jaa Sulje 1/02. Exercise 2.21 Avaa lomake 1/02. Exercise 2.22 Avaa lomake 1/02. Exercise 2.23 Avaa lomake 1/02. Exercise 2.24 Avaa lomake 1/02. Exercise 2.25 Avaa lomake 1/02. Exercise 2.26 Avaa lomake 1/02. Exercise 2.27 Avaa lomake