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4 Roles and each has 4 schools inside.
You can choose any two schools in that role.
I can't really answer that question as I have not paid attention to it but I would say there is none and all hehe. I think you can mix 2 of them at a time but you also can be all them on your character. This is a game where you don't need alts only one character and does it all. But since there was ehhh everyone was exactly the same in the last game they added some classes I guess and ugh yeah I can't be much help there but still even if it was 4 its always feel more then that.
Edit: ahh there you go he beat me to it
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