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D Dominant 7th (♭5) :: D F♯ A♭ C

A
E
C
G
♭7
♭5
3
D
♭7
♭5
D
♭7
3
D
♭7
♭5
3
D
♭5
3
⬤ ⬤
♭7
⬤ ⬤
D A♭
B Diminished 7th :: B D F A♭

A
E
C
G
♭5
𝄫7
B
♭3
𝄫7
B
♭3
♭5
B
♭3
♭5
𝄫7
♭3
♭5
𝄫7
B
⬤ ⬤
⬤ ⬤