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How to Use This Article
Throughout this article you will find text that is underlined and highlighted in a different color. These are links to additional information such as definitions, other articles, and useful books. When clicked, additional information will be presented in a pop-up box or new browser window. At the end of this article we re-list all the links for your convenience.
Key to linked words within the article:
Red underlined words - click for word definition
Blue underlined words - click for related information
We suggest that you first completely read through this article without selecting any of the blue underlined links. Readers find them more informative when taken in context to the whole article. Then, as you read the article a second time, click the blue underlined links that are of interest.
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