content_image/888125.jpg content_image/888124.jpg content_image/888126.jpg content_image/888127.jpg
<img src='content_image/888125.jpg'>

<img src='content_image/888124.jpg'>

## Example 2-9 Polymer 9 

## Example 2-10 Polymer 10 

<img src='content_image/888126.jpg'>

<img src='content_image/888127.jpg'>

## Example 2-11 Polymer 11 

