I learned 30 years ago from a blues electric guitarist and have adapted as a mandolin blues lick. It’s a bit of a tongue twister that outlines the 9th chord. It’s an arpeggio that sounds cool played fast as either a back up/fill lick or played through the changes. It’s in a closed position so you can easily play anywhere.
Tablature and other mandolin blues licks are available at my patreon site: patreon.com/jimrichter