There are three groups in this football match. Except for the top two in the three groups, the third best performer in the two groups entered the quarter-finals. How should the quarter-finals be playe

There are three groups in this football match. Except for the top two in the three groups, the third best performer in the two groups entered the quarter-finals. How should the quarter-finals be played in this case? Actually, there are several schemes.

The simplest solution is to completely disrupt the lottery, which is the simplest.

The first of the three groups avoided each other, and the second avoided each other and drew lots.

The top two of the three groups avoid drawing lots.

Generally speaking, it is simpler and fairer to select eight teams from a *** 12 team and divide the top four teams into two groups.