R h 2

R h 2R h 2R h 2R h 2
R h 2R h 2R h 2R h 2R h 2R h 2R h 2R h 2
R h 2R h 2R h 2R h 2R h 2R h 2R h 2R h 2R h 2R h 2R h 2R h 2
R h 2R h 2R h 2R h 2R h 2R h 2R h 2R h 2R h 2R h 2R h 2R h 2R h 2R h 2R h 2R h 2
R h 2R h 2R h 2R h 2R h 2R h 2R h 2R h 2