Hi Sciurius

On the first page the two chords a1 and a2 (C^ and C^7) are the same chords (1 3 5 M7) but with different names C^ and C^7
This is the same with the three chords (b1 b2 and b3) They are the same chords (1 b3 b5 7) but with three differents names(Cø Cø7 and C-7b5)

Have a good day.
Gabor