Its basically a Swiss format. Every #1 placed team will go against the #2 placed team and no teams of the same region could face each other.
From 8 teams after first round, we will end up with 4 teams with 1-0 record and 4 teams with 0-1 record.
The 4 teams with 1-0 records will play this style again and there will be 2 teams with 2-0 record who will be qualified for playoffs and the remaining 2 teams with 1-1 record.
The 4 teams with 0-1 record will play this style again and there will be 2 teams with 1-1 record and 2 teams with 0-2 record who will be eliminated.
Now collectively we got 4 teams with 1-1 record who will battle it out until there are 2 teams with 2-1 record are standing who will qualify for the playoffs and join the other 2 teams with 2-0 record. The remaining 2 teams will be eliminated.