Flam accents in triplet form with the second note of the tuplet played as an unaccented double stroke.
> | > ||
(Rl) (ll) r | (Lr) (rr) l ||
| ||
|____ 3 ____| |____ 3 ____|
Also see
diddling the flam for information pertaining to standard
percussion rudiments that feature flams and augmentations.