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)