1.1 problem 1(a)
1.2 problem 1(b)
1.3 problem 1(c)
1.4 problem 1(d)
1.5 problem 1(e)
1.6 problem 1(f)
1.7 problem 2(a)
1.8 problem 2(b)
1.9 problem 2(c)
1.10 problem 2(d)
1.11 problem 2(e)
1.12 problem 3(a)
1.13 problem 3(b)
1.14 problem 3(c)
1.15 problem 3(a)
1.16 problem 4(a)
1.17 problem 4(b)
1.18 problem 4(c)
1.19 problem 4(d)
1.20 problem 5(a)
1.21 problem 5(b)
1.22 problem 5(c)
1.23 problem 5(d)