_______________________________________________
Example 7.2
_______________________________________________
Example 7.3
_______________________________________________
Example 7.4
_______________________________________________
Example 7.5
_______________________________________________
Example 7.6
_______________________________________________
Example 7.7
_______________________________________________
Example 7.8
_______________________________________________
Example 7.9
_______________________________________________
Example 7.10
_______________________________________________
Example 7.11
_______________________________________________
Example 7.12
_______________________________________________
Example 7.13
_______________________________________________
Example 7.14
_______________________________________________
Example 7.15