                       C F G -   G - C D          -  C, F, Cm

                       C F G - C G - C D          -  C, F, Cm


       Bb  Eb  Ab  C     F G - C G - C D          \
                                                         C, F, Cm, Fm, Dm
    [  C   F   Bb  D  ]  F G - C G - C D          /
         -  +2  -       


   Bb  Eb  Ab  C       F G A - C G - C D          \
                                                     C, F, Cm, Fm, Dm
[  C   F   Bb  D  ]    F G A - C G - C D          /
     -  +2  -       

