20
21
16
16
15
21
21
16
15
15
16
21
21
21
21
21
21
17
12
16
19
21
16
18
21
21
16
21
16
16
8
19
21
19
16
12
21
21
20
16
21
21
20
21
21
16
21
21
20
16
21
21
21
21
16
16
16
16
21
21
21
21
21
21
21
20
21
21
16
21
21
21
16
21
16
21
21
16
21
21
17
16
21
21
19
21
21
21
20
21
16
16
21
16
21
21
21
16
21
21