There are six teams in this basketball game. How to play?

First, divide the six teams into group A and group B, and draw lots to decide. Three teams in each group play round robin, that is, each team plays in each group. If Team A has three teams, then the competition system is A vs B, A vs C and B vs C, so that the top two teams in each group will be eliminated, and the remaining four teams will be eliminated, with Group A being the first in vs B, Group A being the second in vs B being the first, and the losing team will be eliminated directly, and then the rest will be eliminated. I hope you can understand.