Guitar chords: F diminished seventh
Fdim7
 XX
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 ||1|2|  3rd fret
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 |||3|4
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   FCEA
    bbb
     b

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

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