[practice] Single-double combinations

This is mostly a simplification of the first page of George Lawrence Stone's Stick Control, which should be in every drummer's library. While Stone pushes through all possible right/left combinations of four strokes, I tend to focus on just the singles and doubles. Basically, this is just a single-stroke roll, a double-stroke roll, and every permutation of a single paradiddle (RLRR LRLL), played at an even tempo. You should keep this one going for a while, and try it at slow, medium and fast tempos.

RLRL RLRL RLRL RLRL
RRLL RRLL RRLL RRLL
RLRR LRLL RLRR LRLL
RLLR LRRL RLLR LRRL
RRLR LLRL RRLR LLRL
RLRL LRLR RLRL LRLR

LRLR LRLR LRLR LRLR
LLRR LLRR LLRR LLRR
LRLL RLRR LRLL RLRR
LRRL RLLR LRRL RLLR
LLRL RRLR LLRL RRLR
LRLR RLRL LRLR RLRL