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Florida Gators head coach Dan Mullen walks on the field during pregame warmups prior to facing the Alabama Crimson Tide in the SEC championship game at Mercedes-Benz Stadium on Dec. 19 in Atlanta, Ga. (KEVIN C. COX/Getty Images/TNS)
ARLINGTON, Texas — Dan Mullen has been part of two national championships with Florida, the last for the Gators coming in a win over Oklahoma in his final game as their offensive coordinator before…