| ! | Part of this article was copied from Citizendium and Wikipedia but the copied text was originally written by me, RJJensen (under the name Richard Jensen and rjensen). Other material is copied by permission of the sites. | 
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| ! | Part of this article was copied from Citizendium and Wikipedia but the copied text was originally written by me, RJJensen (under the name Richard Jensen and rjensen). Other material is copied by permission of the sites. |
|