What is the competition system of the National Finals 10 of China Tibetan Song Club? Is grouping a lottery?

Draw lots. I checked the Tibetan Song Club Sina Weibo, and the number 1 1 Weibo announced the rules of the game on Friday. First of all, it is divided into two groups, A and B, with pairwise PK. The winner will advance to the top 10, which is the team product 1 point. The final number of judges will be selected from the group with high scores. Sharper than the 30-20 game. Everyone has only one chance. Every PK is an S war.