with the third and fourth places in Primera B Nacional, counted by its aggregate table. In Primera B Nacional, the same procedure continues in use for relegation to either Primera B Metropolitana or Torneo Argentino A for non-Buenos Aires clubs. From 2015 onward, relegation from the Primera División will be based solely on league position at the end of the season (which, effective in 2016–17, changed from a February–December format to an August–June format). Australia The Australian A-League, which also features a team in New Zealand, has determined its champions via a playoff system, officially known as the "Finals Series" (reflecting standard Australian English usage), since its inception in the 2005–06 season. From the league's inception through the 2008–09 season, the top four teams advanced to the finals series, employed using a modified Page playoff system. The top two teams at the end of league play were matched in one semifinal, with the winner advancing directly to the grand final and the loser going into the Preliminary Final. The next two teams played a semifinal for a place in the Preliminary Final, whose winner took the other place in the grand final. Both semifinals were two-legged, while the Preliminary Final and Grand Final were one-off matches. When the league expanded to 10 teams beginning in 2009–10, the finals expanded to six teams. The format of the six-team playoff established at that time was: The "semifinals" were held over a two-week period. The pairings for Week 1 of the semifinals were 1 vs 2, 3 vs 6, and 4 vs 5. In Week 1, the top two teams played the first leg of a two-legged match, and the remaining teams played one-off knockout matches. In Week 2, the top two teams played the second leg of their semifinal, and the two other surviving teams played a one-off match. The winner of the two-legged match advanced directly to the grand final, while the loser of that match joined the winner of the last semifinal in the Preliminary Final. The Preliminary Final and Grand Final remained unchanged. Starting with the 2012–13 season, the finals format has been changed to a pure knockout tournament consisting entirely of one-off matches: In Week 1, two Elimination Finals will be held, with the pairings being 3 vs 6 and 4 vs 5. In Week 2, the winners of the Elimination Finals advance to Semi-Finals. The top team