4
2
1
1
6
2
1
1
9
2
1
1
11
2
1
1
12
2
1
1
13
2
1
1
15
2
1
1
16
2
1
1
18
2
1
1
19
2
1
1
20
2
1
1
21
2
1
1
25
2
1
1
