Guitar chords: D diminished seventh
Ddim7
 XXO O
 ======
 |||1|2  1st fret
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 ||||||
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   DACF
    bb

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

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