1
2
1
1
2
2
1
1
3
2
1
1
6
2
1
1
7
2
1
1
8
2
1
1
9
2
1
1
10
2
1
1
12
2
1
1
15
2
1
1
18
2
1
1
20
3
2
2
21
2
1
1
