5.1 problem 116
  5.2 problem 117
  5.3 problem 118
  5.4 problem 119
  5.5 problem 120
  5.6 problem 121
  5.7 problem 122
  5.8 problem 123
  5.9 problem 124
  5.10 problem 125
  5.11 problem 126
  5.12 problem 127
  5.13 problem 128
  5.14 problem 129
  5.15 problem 130
  5.16 problem 131
  5.17 problem 132
  5.18 problem 133
  5.19 problem 134
  5.20 problem 135
  5.21 problem 136
  5.22 problem 137
  5.23 problem 139
  5.24 problem 140
  5.25 problem 141
  5.26 problem 142
  5.27 problem 143
  5.28 problem 144
  5.29 problem 145
  5.30 problem 146