Instruction
Great job! Now we need to take care of club data. There are only two helper functions left!
Exercise
Create a function named return_sorted_clubs(players) that takes the players list (as shown in the template) and returns a sorted list of all clubs for which the players play or used to play.
Stuck? Here's a hint!
For each player in the players list, the club in which they play is player[5], and the clubs in which they have played before are elements of the player[6] list.



