A unit held a half-court 3-on-3 basketball match, and 12 teams participated. Requirements: The game ends in one and a half days, and each team plays four times. Try to design a game program.

Divide the 12 team into 6 groups according to the actual situation and carry out the elimination match. In such six games, six winning teams entered the championship group and six losing teams entered the 6- 12 ranking group. So each team played a game.

According to the general strength, the six teams in the championship draw 22 games, the three winning teams enter the championship group, and the three losing teams enter the 4-6 qualifying;

Six teams in the 6- 12 qualifying group will draw lots for 22 matches, with three winning teams competing for the 7-9 qualifying and three losing teams competing for the 10- 12 qualifying;

So far, each team has played two games.

The above competition will be completed in half a day.

Now there are champion groups, 4-6 qualifying groups, 7-9 qualifying groups and 10- 12 qualifying groups, with 3 teams in each group.

The second half day: 7-9 qualifying group and 10- 12 qualifying group. Three teams in each group will play two games in turn, ranking according to the results.

The third half-day: champion group, 4-6 qualifying groups, each group cycle 3 teams, each playing 2 games, ranked according to the results.

In this way, each team played four games. It always takes three and a half days.

The picture is only a schematic diagram of all the competitions of the six champion teams in the first half of the day, and so are the six teams that entered the qualifying session.