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October 4, 1968
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April 13, 1979
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July 18, 1980
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April 8, 1983
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May 29, 1981
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June 1, 1981
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October 15, 1981
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November 16, 1984
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November 22, 1984
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August 16, 1985
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July 3, 1985
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October 18, 1985
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November 1, 1985
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August 21, 1986
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March 13, 1987
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September 16, 1987
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October 1, 1989
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October 19, 1990
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February 12, 1993
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February 19, 1993
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October 1, 1993
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June 11, 1998
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June 27, 2003
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April 4, 2003
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November 23, 2004
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March 19, 2004
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September 24, 2004
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June 24, 2005
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October 15, 2005
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October 15, 2005
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June 15, 2007
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April 6, 2007
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May 11, 2007
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September 20, 2007
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October 17, 2008
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December 14, 2007
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April 8, 2008
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September 9, 2008
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November 15, 2008
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June 9, 2009
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January 20, 2009
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May 29, 2009
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June 12, 2009
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September 25, 2009
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October 8, 2009
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October 26, 2010
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August 2, 2013
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November 28, 2012
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February 1, 2013
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April 5, 2013