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BELFAST, NORTHERN IRELAND - JANUARY 23: Rob Herring (C) of Ulster is tackled by Julien Blanc (L) of Oyonnax during the European Champions Cup Pool 1 round 6 game between Ulster and Oyonnax at Kingspan Stadium on January 23, 2016 in Belfast, Northern Ireland. (Photo by Charles McQuillan/Getty Images)

BELFAST, NORTHERN IRELAND - JANUARY 23:   Rob Herring (C) of Ulster is tackled by Julien Blanc (L) of Oyonnax during the European Champions Cup Pool 1 round 6 game between Ulster and Oyonnax at Kingspan Stadium on January 23, 2016 in Belfast, Northern Ireland.  (Photo by Charles McQuillan/Getty Images)