20.13Level 6 — extensions

At medium tempo:

B♭6/9

G13

Cm9

F13.

Example:

B♭6/9: LH B♭-F RH D-G-C

G13: LH G RH F-B-E

Cm9: LH C RH E♭-B♭-D

F13: LH F RH E♭-A-D.

Very usable.