Guitar chords: Aflat diminished seventh
Abdim7
 XX
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 ||1|2|  6th fret
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 |||3|4
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   AEGC
   bbbb
    bb

Notes: 1  : Ab 
       m3 : Cb
       d5 : Ebb  
       bb7: Gbb
These diminished chords all have the same notes as each other: Fdim7, Abdim7, Bdim7, and Ddim7.

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