third edition second edition

2.3 2.2

2.6 2.3

2.7 2.4

2.9 2.5

2.10 2.6

2.11 2.7

2.14 2.10

2.15 2.11

2.17 2.13

2.25 2.21

2.30 2.25

2.37 2.29

2.39 2.31

2.53 2.45

2.67 2.48

2.83 2.55

2.94 2.65

2.97 2.69

2.98 2.70