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The views and conclusions expressed in this document are those of the author. They are not intended and should not be thought to represent official ideas, attitudes, or policies of any agency of the United States Government. The author has not had special access to official information or ideas and has employed only open-source material available to any writer on this subject. This document is the property of the United States Government. It is available for distribution to the general public. A loan copy of the document may be obtained from th