4
2
1
1
6
2
1
1
7
21
20
20
8
2
1
1
12
2
1
1
13
3
2
2
16
2
1
1
17
2
1
1
18
2
1
1
19
-7
-8
-8
20
5
4
4
24
2
1
1
