2.5Guide-tone skeleton

For Cm7:

3rd = E♭

7th = B♭

For F7:

3rd = A

7th = E♭

For B♭maj7:

3rd = D

7th = A

A very smooth RH skeleton is:

E♭-B♭ → E♭-A → D-A

Notice:

B♭ → A

E♭ stays

then:

E♭ → D

A stays.

Minimal motion.