RLRR LRLL RLLR LLRR LRRL RLRL RLRL R///
Below is a simpler and probably better variation. Accent those yanking lefts on the last half of the pattern:
RLRR LRLL RLLR LLRL RLRR LRRL RLRL R///
And then loop it into an exercise:
RLRR LRLL RLLR LLRL | RLRR LRRL RLRL RLRL | etc.