R 1 2

R 1 2R 1 2R 1 2R 1 2R 1 2R 1 2R 1 2R 1 2R 1 2R 1 2R 1 2R 1 2R 1 2R 1 2R 1 2R 1 2R 1 2R 1 2R 1 2R 1 2R 1 2R 1 2R 1 2R 1 2R 1 2R 1 2R 1 2R 1 2R 1 2R 1 2R 1 2R 1 2R 1 2R 1 2R 1 2R 1 2R 1 2R 1 2R 1 2R 1 2R 1 2R 1 2R 1 2R 1 2R 1 2R 1 2R 1 2R 1 2