 Complete the following phrase:  Teams compete in a double round robin tournament over the course of nine weeks during the regular season, with matches being best-of-three. The top six teams from the regular season advanced to the playoff stage, with the top two teams receiving a bye to the semifinals. The seventh place team qualifies for the next split of the LCS but does not participate in playoffs. The bottom three teams play in a promotionrelegation tournament against the top two NA Challenger Series teams. Playoffs were single-elimination and matches were best-of-five. The winner of the summer split automatically qualified for the 