Guitar chords: B diminished seventh
Bdim7
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 ||1|2|  9th fret
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 |||3|4
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   BFAD
     b   

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

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