32 of the teams in the tournament are the best teams in each Division I conference. 36 of the teams join the tournament by winning other basketball games. These teams are chosen by the NCAA to be in the tournament. For the tournament, there are four regions. Each team is put into a region. Each region has 16 teams. The tournament has seven rounds. It is three weeks long. The first round is called the First Four. It has eight teams in it. The four winning teams join the tournament.
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