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LONDON, ENGLAND - JANUARY 17: Rob Buchanan (unseen) of Harlequins barges over to score the opening try during the European Rugby Challenge Cup pool three match between Harlequins and Cardiff Blues at the Twickenham Stoop on January 17, 2016 in London, England. (Photo by Steve Bardens/Getty Images for Harlequins)

LONDON, ENGLAND - JANUARY 17:  Rob Buchanan (unseen) of Harlequins barges over to score the opening try during the European Rugby Challenge Cup pool three match between Harlequins and Cardiff Blues at the Twickenham Stoop on January 17, 2016 in London, England.  (Photo by Steve Bardens/Getty Images for Harlequins)