(FILE PHOTO) Manchester United manager Sir Alex Ferguson has announced that he will retire at the end of the season after 26 years in charge. BIRMINGHAM, ENGLAND - FEBRUARY 10: Sir Alex Ferguson of Manchester United walks out during the Barclays Premier League match between Aston Villa and Manchester United at Villa Park on February 10, 2010 in Birmingham, England.  (Photo by Laurence Griffiths/Getty Images)
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