Obs.: this phase illustrate a common Brazilian tournament scheduling, still popular nowadays as proved by 2006 Rio state league (Campeonato Carioca), dubbed here "split round-robin". In this scheduling, a pool of teams are split in two (or more) groups but play against all others as in a full single round-robin system. In general they will play in two stages against their own group opponents in a row (called here "internal stage") then with the other group's opponents ("external" stage). Many variants are then possible as to how the final phase is organized upon. Often each stage will have its champion and runner-up, and play-offs are organized accordingly. This system has been often used to accommodate calendar constraints as double round-robin systems would require too many rounds. The home and away matches are distributed randomly.