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New Zealand's fly half Dan Carter (L) and New Zealand's flanker and captain Richie McCaw celebrate with the Webb Ellis Cup after winning 34-17 during the final match of the 2015 Rugby World Cup between New Zealand and Australia at Twickenham stadium, south west London, on October 31, 2015. AFP PHOTO / GLYN KIRK RESTRICTED TO EDITORIAL USE, NO USE IN LIVE MATCH TRACKING SERVICES, TO BE USED AS NON-SEQUENTIAL STILLS (Photo by GLYN KIRK / AFP) (Photo credit should read GLYN KIRK/AFP via Getty Images)

New Zealand's fly half Dan Carter (L) and New Zealand's flanker and captain Richie McCaw celebrate with the Webb Ellis Cup after winning 34-17 during the final match of the 2015 Rugby World Cup between New Zealand and Australia at Twickenham stadium, south west London, on October 31, 2015.  AFP PHOTO / GLYN KIRK

RESTRICTED TO EDITORIAL USE, NO USE IN LIVE MATCH TRACKING SERVICES, TO BE USED AS NON-SEQUENTIAL STILLS (Photo by GLYN KIRK / AFP)        (Photo credit should read GLYN KIRK/AFP via Getty Images)