A forum to this puzzle: https://www.codingame.com/ide/puzzle/vox-codei-episode-2
In fact there’s one : https://www.codingame.com/forum/t/vox-codei-puzzle-discussion/285
It’s the same thread than episode 1. But since the “discussion” link of the episode 2 redirect on it, I think it’s preferable to let the things like this.
So I close this one.
EDIT : The episode 2 link has been edited to point here, so I re-open the thread.