Complete exercise 2.27
Complete exercise 2.28
Complete exercise 2.29
Complete exercise 2.30
Complete exercise 2.31
Complete exercise 2.32
Complete exercise 2.33
Complete exercise 2.35
Complete exercise 2.36
Complete exercise 2.38
Complete exercise 2.39
Complete exercise 2.40
Complete exercise 2.41
Complete exercise 2.53
Complete exercise 2.54
Complete exercise 2.59
Complete exercise 2.60
Complete exercise 2.61
Complete exercise 2.62
Complete exercise 2.66