where $f_1, f_2, f_3, f_4$ are the faces.
In the textbook, it gives the degrees of the four faces as $$deg(f_1) = 6$$ $$deg(f_2) = 3$$ $$deg(f_3) = 5$$ $$deg(f_4) = 14$$
I don't understand how they got 6 for $f_1$ and 14 for $f_4$. I know this is a very simple question, but I'm just not getting it for some reason. I would appreciate the help.