G♭ Minor 7th (♭5)
::
G♭
A
C
E
A
E
C
G
♭3
♭7
♭5
G♭
♭3
⬤
♭5
⬤
♭7
⬤
♭3
♭5
⬤
G♭
⬤
♭7
⬤
♭5
⬤
G♭
♭3
♭7
⬤
G♭
⬤ ⬤
♭3
♭7
♭5
⬤ ⬤