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DUBLIN, IRELAND - MAY 17: (NO UK SALES FOR 28 DAYS) Queen Elizabeth II accompanied by President Mary McAleese arrives to lay a wreath at Dublin Memorial Garden on May 17, 2011 in Dublin, Ireland. The Duke and Queen's visit is the first by a monarch since 1911. An unprecedented security operation is taking place with much of the centre of Dublin turning into a car free zone. Republican dissident groups have made it clear they are intent on disrupting proceedings (Photo by Samir Hussein/WireImage)

DUBLIN, IRELAND - MAY 17: (NO UK SALES FOR 28 DAYS) Queen Elizabeth II  accompanied by President Mary McAleese arrives to lay a wreath at Dublin Memorial Garden on May 17, 2011 in Dublin, Ireland.  The Duke and Queen's visit is the first by a monarch since 1911. An unprecedented security operation is taking place with much of the centre of Dublin turning into a car free zone. Republican dissident groups have made it clear they are intent on disrupting proceedings (Photo by Samir Hussein/WireImage)