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GLOUCESTER, ENGLAND - APRIL 9: Rob Cook of Gloucester Rugby is tackled by Carl Meyer of Newport Gwent Dragons during the European Rugby Challenge Cup match between Gloucester Rugby and Newport Gwent Dragons at Kingsholm Stadium on April 9, 2016 in Gloucester, United Kingdom. (Photo by David Jones/Getty Images)

GLOUCESTER, ENGLAND - APRIL 9:   Rob Cook of Gloucester Rugby is tackled by Carl Meyer of Newport Gwent Dragons during the European Rugby Challenge Cup match between Gloucester Rugby and Newport Gwent Dragons at Kingsholm Stadium on April 9, 2016 in Gloucester, United Kingdom.  (Photo by David Jones/Getty Images)