1
2
1
1
2
2
1
1
3
2
1
1
4
2
1
1
5
2
1
1
6
2
1
1
7
2
1
1
8
2
1
1
15
2
1
1
17
2
1
1
19
2
1
1
20
2
1
1
22
2
1
1
23
2
1
1
