20.7Level 2 — shells

B♭maj7:

D-A

G7:

B-F

Cm7:

E♭-B♭

F7:

A♭-A? Careful—F7 guide tones are:

A-E♭

So use:

B♭maj7: D-A

G7: B-F

Cm7: E♭-B♭

F7: A-E♭

B♭maj7: D-A.

Keep voicings compact.