| ! | 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) and does not include alterations made by others on that site. | 
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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) and does not include alterations made by others on that site. |
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