Divide the 12 team into 4 groups with 3 teams in each group for round robin.
Each team in the group plays a game.
The next step is to see if you want to win the quarterfinals or the quarterfinals.
The quarter-finals are the top two in each group, and the quarter-finals are the first in each group.
The standard is determined by the victory of each team, and the same victory is determined by the number of games or the total score.
After taking out the quarter-finals or the quarter-finals, it would be good to play a single knockout.
In the group match, draw four triangles, and put a team at the vertex of each triangle.
You only need to draw a rough branch map in one round of elimination.