Option 1: draw lots to decide the group stage, which can be divided into two groups, and then each group will determine two or three qualifying places, but the qualifying team will draw lots to decide whether to eliminate or qualify!
Scheme 2: According to the basketball level of each group, it is divided into three groups. Strong, medium, weak, strong and medium teams make up three teams, two teams qualify respectively, and two teams of the remaining four weaker teams qualify, and then these six teams are the knockout rounds!