How to determine the Champions League 16?

First, according to the number of places allocated by UEFA, plus the play-offs, the top 32 were decided, and then they were divided into 8 groups, with 4 teams in each group playing double round robin. The top two in each group entered the 16, the third entered the Europa League (the original UEFA Cup), and the fourth was eliminated and went home. The top 16 teams were divided into two and a half areas, and the football association staggered two rounds of elimination, and the winner entered the top eight.