..R2R2R2R2..................R2R2R2R2.....
..R2...........R2..........R2.............R2..
..R2...........R2..........................R2..
..R2...........R2.......................R2.....
..R2 R2R2R2........................R2........
..R2....R2........................R2...........
..R2.......R2..................R2..............
..R2..........R2.............R2R2R2R2R2...