Also D Diminished (half-whole), F Diminished (half-whole)
C Diminished (whole-half): C D E♭ F G♭ A♭ A B. Formula 1 2 ♭3 4 ♭5 ♭6 6 7. Same notes as D Diminished (half-whole), F Diminished (half-whole), A♭ Diminished (half-whole). Whole and half steps in turn, starting with a whole step: it fits diminished 7th chords and repeats every minor 3rd.