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