2. According to the teams drawn by lot within the group, the computer will randomly sort the teams and play in sequence, but in the form of round robin, and finally decide one or two places.
3. According to the winners of each group, they are divided into two and a half regions (there are one or two seed teams in the upper and lower regions), and then the competitions are randomly arranged by computer, and finally the top eight are decided, then the top four, and then the semi-finals and finals.