It is suggested to divide into four groups. In fact, as long as the number of teams is not too large, they should be divided into four groups. The number of teams in four groups is 4/4/4/5, and there are five teams in one group, and each group takes the first two points (or directly takes the first place), so that the remaining teams are eight teams (taking the first place as four teams), and the eight teams or four teams can directly play the quarterfinals and four teams elimination.
If you are divided into 8 teams, it is important to remember that two teams of the same team should not be in the same half area. If A 1 and A2 advance to Group A, make sure that the two teams will not meet again before the final. If it is not in the same half, you should know what is going on.
There are also individual competition systems that occasionally meet in the semi-finals of A 1A2, which can be seen in the NBA playoffs. This is generally to prevent two teams from the same area from appearing in the finals at the same time. This is the most common in table tennis international competitions, but even so, China is still too strong ~