In its current format, clubs finishing third in their respective groups in the UEFA Champions League (UCL) qualify, if you will, for the round of 32 knockout stage of the UEFA Europa League (UEL).
As with the UCL, the top two finishers for each group of the UEL qualify for the next round. In the UCL, group winners play a runner up from a different group. I assume this doesn't happen in the UEL. How are the 8 UCL teams integrated into the UEL?