Assetto Corsa Career mode tree 1

This file I'm uploading is a Scheme of the Assetto Corsa career progression, no mod or anything. You start from N1 and procede. It's a simple scheme, just follow the paths. Any square that has more than one arrow pointing it needs more requirements. On the other hand, any path that merge with another and results in only one arrow means that only one category is required. As simple as that. I took the simbols (for example N1, N2 etc etc) from content manager but normal Assetto Corsa has these too. I hope you need this and if you have any suggestion feel free to let me know

Edit: in Content Manager is a bit buggy. Also I screwed up a bit and actually you need both I1 and I2 for I3, meanwhile you need only I1 or I2 to get to T1