1-1
1-2
2-1
2-2
3-1
3-2
3-3
3-4
4-1
4-2
4-3
5-1
5-2
6-1
7-1
8-1
8-2
9-1
9-2
10-1
10-2
11-1
12-1
12-2
13-1
14-1
14-2
15-1
16-1
16-2
16-3
16-4
17-1
17-2
18-1
19-1
19-2
19-3
20-1
20-2
20-3
20-4
20-5
21-1
21-2
1-1
1-2
2-1
2-2
3-1
3-2
3-3
3-4
4-1
4-2
4-3
5-1
5-2
6-1
7-1
8-1
8-2
9-1
9-2
10-1
10-2
11-1
12-1
12-2
13-1
14-1
14-2
15-1
15-1
16-1
16-2
16-3
16-4
17-1
17-2
18-1
19-1
19-2
19-3
20-1
20-2
20-3
20-4
20-5
21-1
21-2