14.1 problem 1(a)
  14.2 problem 1(b)
  14.3 problem 1(c)
  14.4 problem 1(d)
  14.5 problem 1(e)
  14.6 problem 1(f)
  14.7 problem 1(g)
  14.8 problem 1(h)
  14.9 problem 2(a)
  14.10 problem 2(b)
  14.11 problem 2(c)
  14.12 problem 2(d)
  14.13 problem 2(e)
  14.14 problem 2(f)
  14.15 problem 2(g)
  14.16 problem 2(h)
  14.17 problem 3(a)
  14.18 problem 3(b)
  14.19 problem 3(c)
  14.20 problem 3(d)
  14.21 problem 3(e)
  14.22 problem 3(f)
  14.23 problem 3(g)
  14.24 problem 3(h)
  14.25 problem 4(a)
  14.26 problem 4(b)
  14.27 problem 4(c)
  14.28 problem 4(d)