A remnant (or rather off-spring) from a larger (un-published) lesson.

The original lesson took a 12-beat per Bar arpeggio pattern, consisting of 4 repeated triplet groups, which was systematically divided by 1, 2, 3, 4 and 6, to provide different bass accompaniments.
Used for practicing 3-finger picking and thumb independance.

Divisions of 3 and 6 produce polyrhythmic variations against the 4 group theme; however I could not resist the temptation to develop the repeated triplets into something a little more interesting, which detracted from the original focus of pure rhythmic division ...

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Triplets played on the top three strings (invariant pattern throughout) using the following fingering :-

3 2 1 3 2 1 3 2 1 3 2 1 | .. [ 1=1st finger, 2=2nd finger, 3=3rd finger ]

Bass notes played with the thumb (what else?).