Guitar chords: A diminished seventh
Adim7
 XX
 ======
 ~~~~~~
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 ||1|2|  7th fret
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 |||3|4
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 ||||||
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   AEGC
    bb

Notes: 1  : A 
       m3 : C
       d5 : Eb  
       bb7: Gb
These diminished chords all have the same notes as each other: F#dim7, Adim7, Cdim7, and Ebdim7.

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