2.1.1 Problem 1(a)
2.1.2 Problem 1(b)
2.1.3 Problem 1(c)
2.1.4 Problem 1(d)
2.1.5 Problem 1(e)
2.1.6 Problem 1(f)
2.1.7 Problem 2(a)
2.1.8 Problem 2(b)
2.1.9 Problem 2(c)
2.1.10 Problem 2(d)
2.1.11 Problem 2(e)
2.1.12 Problem 3(a)
2.1.13 Problem 3(b)
2.1.14 Problem 3(c)
2.1.15 Problem 3(a)
2.1.16 Problem 4(a)
2.1.17 Problem 4(b)
2.1.18 Problem 4(c)
2.1.19 Problem 4(d)
2.1.20 Problem 5(a)
2.1.21 Problem 5(b)
2.1.22 Problem 5(c)
2.1.23 Problem 5(d)