20
21
21
21
21
21
21
16
21
21
21
21
21
21
21
21
21
21
21
21
21
21
21
15
21
12
16
16
21
21
21
21
21
21
21
15
21
16
21
21
12
21
15
15
21
21
21
21
15
21
21
21
12
21
12
21
21
15
21
21
21
16
12
21
21
16
21
21
21
21
21
16
12
21
20
21
21
21
21
21
15
12
21
12
12
21
21
21
21
15
21
12
21
21
9
10
15
12
8
15