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.