How many rounds are there in Nanjing Marathon?

***7 rounds, 3 games in each round, 1 team bye, team number 7 1 to 7, 0 is bye. The following are the specific arrangements.

1, the first round, 1 0, 2 to 7, 3 to 6, 4 to 5;

2, the second round, 1 7, 0 to 6, 2 to 5, 3 to 4;

3. In the third round, 1 6, 7 to 5, 0 to 4, 2 to 3;

4, the fourth round, 1 5, 6 to 4, 7 to 3, 0 to 2;

5, the fifth round, 1 4, 5 to 3, 6 to 2, 7 to 0;

6, the sixth round, 1 3, 4 to 2, 5 to 0, 6 to 7;

7, the seventh round, 1 0, 3 to 2, 4 to 7, 5 to 6.