1.1 problem 2.1 (i)
1.2 problem 2.1 (ii)
1.3 problem 2.1 (iii)
1.4 problem 2.1 (iv)
1.5 problem 2.1 (v)
1.6 problem 2.1 (vi)
1.7 problem 2.2 (i)
1.8 problem 2.2 (ii)
1.9 problem 2.2 (iii)
1.10 problem 2.2 (iv)
1.11 problem 2.2 (v)
1.12 problem 2.2 (vi)
1.13 problem 2.2 (vii)
1.14 problem 2.4 (i)
1.15 problem 2.4 (ii)
1.16 problem 2.4 (iii)
1.17 problem 2.4 (iv)
1.18 problem 2.4 (v)
1.19 problem 2.5