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Dublin , Ireland - 26 November 2016; Ireland captain Rory Best (R) with team-mate Sean Cronin after the Autumn International match between Ireland and Australia at the Aviva Stadium in Dublin. (Photo By Brendan Moran/Sportsfile via Getty Images)

Dublin , Ireland - 26 November 2016; Ireland captain Rory Best (R) with team-mate Sean Cronin after the Autumn International match between Ireland and Australia at the Aviva Stadium in Dublin. (Photo By Brendan Moran/Sportsfile via Getty Images)

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LONDON, ENGLAND - DECEMBER 03: Dylan Hartley, (C) the England captain raises the Cook Cup after their their victory during the Old Mutual Wealth Series match between England and Australia at Twickenham Stadium on December 3, 2016 in London, England. (Photo by David Rogers - RFU/The RFU Collection via Getty Imagesges)

LONDON, ENGLAND - DECEMBER 03:  Dylan Hartley, (C) the England captain raises the Cook Cup after their their victory during the Old Mutual Wealth Series match between England and Australia at Twickenham Stadium on December 3, 2016 in London, England.  (Photo by David Rogers - RFU/The RFU Collection via Getty Imagesges)

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LONDON, ENGLAND - DECEMBER 03: Jamie George of England (R) is tackled by Kane Doughlas of Australia (L) during the Old Mutual Wealth Series match between England and Australia at Twickenham Stadium on December 3, 2016 in London, England. (Photo by David Rogers - RFU/The RFU Collection via Getty Imagesges)

LONDON, ENGLAND - DECEMBER 03: Jamie George of England (R) is tackled by Kane Doughlas of Australia (L) during the Old Mutual Wealth Series match between England and Australia at Twickenham Stadium on December 3, 2016 in London, England.  (Photo by David Rogers - RFU/The RFU Collection via Getty Imagesges)