Thank you very much for this graph. It's much better than the skill tree in Duolingo.
I have a big favor to ask you. Can you make these bars to be active links to practice on Duolingo? (like lower in the skill list - https://www.duolingo.com/skill/cs/Phrases/practice , https://www.duolingo.com/skill/cs/Masculine/practice , https://www.duolingo.com/skill/cs/T2Feminine/practice .... ). If so, it would be perfect.
Or/and, if it's possible, separate the graph at the checkpoint locations. That in itself would be very helpful. E.g. like this:
Maybe it could become a new hall of fame - "The wall" - How high integral wall who will build. (The smallest bar would determine the height of the wall). If you like this idea, I suggest excluding the first part of the skill tree from this rank. It's hell to do these first skills.
Anyway, duome is amazing, thank you very much for this perfect work!