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ALLETTA, MALTA - NOVEMBER 27: Canadian Prime Minister Justin Trudeau and his wife Sophie Gregoire arrive for the opening ceremony of the Commonwealth Heads of Government Meeting (CHOGM) at the Mediterranean Conference Centre on November 27, 2015 near Valletta, Malta. The biennial summit meeting of Commonwealth nations is attended by Queen Elizabeth II, Head of the Commonwealth, along with The Duke of Edinburgh, Prince of Wales and Duchess of Cornwall. (Photo by Toby Melville - Pool /Getty Images)