C/E/F/A Diminished
   

C/E/F/A Diminished

Scale
C Half/Whole Diminished
E Half/Whole Diminished
F Half/Whole Diminished
A Half/Whole Diminished
D Whole/Half Diminished
E Whole/Half Diminished
G Whole/Half Diminished
B Whole/Half Diminished

D Melodic Minor (Acoustic)
D Harmonic Minor
D Harmonic Major
E Melodic Minor (Acoustic)
E Harmonic Minor
F Harmonic Major
G Melodic Minor (Acoustic)
G Harmonic Minor
A Harmonic Major
B Melodic Minor (Acoustic)
B Harmonic Minor
B Harmonic Major

Diminished (Octatonic)

5 7 9 (or 2) 11 (or 4) 13 (or 6)