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C Half Diminished 7th :: C E♭ G♭ B♭

B
F♯
D
A
♭5
C
♭3
♭7
C
♭3
♭7
♭5
C
♭3
♭5
♭7
♭3
♭5
C
♭7
⬤ ⬤
♭5
⬤ ⬤