R 20

R 20R 20R 20R 20
R 20R 20R 20R 20R 20R 20R 20R 20
R 20R 20R 20R 20R 20R 20R 20R 20R 20R 20R 20R 20
R 20R 20R 20R 20R 20R 20R 20R 20R 20R 20R 20R 20R 20R 20R 20R 20
R 20R 20R 20R 20R 20R 20R 20R 20