Task: Question Answering
Input (English): passage: The 2011 NBA Finals was the championship series of the 2010--11 season of the National Basketball Association (NBA) in which the Western Conference champion Dallas Mavericks defeated the Eastern Conference champion Miami Heat 4 games to 2 to win their first NBA championship. The series was held from May 31 to June 12, 2011. German player Dirk Nowitzki was named the Finals MVP, becoming the second European to win the award after Tony Parker (2007) and the first German player to do so. The series was a rematch of the 2006 NBA Finals, which the Heat had won in six games.
 question: did the dallas mavericks ever win the nba championship?
Output (English): Yes