20
21
21
21
21
21
21
21
21
16
21
21
21
21
21
21
21
21
20
21
21
20
21
21
21
21
21
21
21
21
21
21
16
21
17
21
21
21
21
21
21
18
16
21
21
21
21
21
16
21
21
21
21
21
21
16
16
17
21
21
16
17
16
21
21
20
21
16
19
21
21
19
21
21
16
16
15
11
17
16
21
16
19
16
8
21
19
16
13
18
20
20
19
16
18
12
21
16
14
17