Five teams took part in the debate. How to eliminate them is reasonable?

The draw is divided into two groups, one group of two teams, one group of three teams and one group of two dozen. The winner enters the final, and the three teams play three rounds in a round robin, and the one with the best score enters the final. It's best to use the scoring system and look at the scores under the same record, so there will be five finals. In addition, it can be divided into two teams in Group A, two teams in Group B, one team in Group C/KLOC-0, one game in Group B and one game in Group C, and then compete with Group A for the championship. This is the end of four games.