2.1.1 problem 1 (i)
2.1.2 problem 1 (ii)
2.1.3 problem 1 (iii)
2.1.4 problem 1 (iv)
2.1.5 problem 1 (v)
2.1.6 problem 1 (vi)
2.1.7 problem 2 (i)
2.1.8 problem 2 (ii)
2.1.9 problem 2 (iii)
2.1.10 problem 2 (iv)
2.1.11 problem 2 (v)
2.1.12 problem 2 (vi)
2.1.13 problem 3 (i)
2.1.14 problem 3 (ii)
2.1.15 problem 3 (iii)
2.1.16 problem 3 (iv)
2.1.17 problem 3 (v)
2.1.18 problem 3 (vi)
2.1.19 problem 4 (i)
2.1.20 problem 4 (ii)
2.1.21 problem 4 (iii)
2.1.22 problem 4 (iv)
2.1.23 problem 4 (v)
2.1.24 problem 4 (vi)
2.1.25 problem 5
2.1.26 problem 6