How to arrange the badminton round robin of Team 9?

In the preliminary round, nine teams can be divided into three groups on average, or 4, 5 points, or 5, 5 points to draw lots to produce the bye team.

A round robin system is adopted, and each group produces a badminton team to enter the final stage.

In the final, the three teams played two more games, and the champion team scored the most.