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Prior content in this article duplicated one or more previously published sources. The material was copied from: http://web.mit.edu/nse/lester/about/index.html. Copied or closely paraphrased material has been rewritten or removed and must not be restored, unless it is duly released under a compatible license. (For more information, please see "using copyrighted works from others" if you are not the copyright holder of this material, or "donating copyrighted materials" if you are.)
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Prior content in this article duplicated one or more previously published sources. The material was copied from: http://web.mit.edu/nse/lester/about/index.html. Copied or closely paraphrased material has been rewritten or removed and must not be restored, unless it is duly released under a compatible license. (For more information, please see "using copyrighted works from others" if you are not the copyright holder of this material, or "donating copyrighted materials" if you are.)