1r
1v
2r
2v
3r
3v
4r
4v
5r
5v
6r
6v
7r
7v
8r
8v
9r
9v
10r
10v
11r
11v
12r
12v
13r
13v
14r
14v
15r
15v
16r
16v
17r
17v
18r
18v
19r
19v
20r
20v
21r
21v
22r
22v
23r
23v
24r
24v
25r
25v
26r
26v
27r
27v
28r
28v
29r
29v
30r