21
21
21
21
21
21
21
21
21
21
21
21
21
21
14
21
17
21
21
21
21
10
21
17
21
21
21
21
21
21
21
15
21
21
21
21
21
21
21
21
21
21
21
11
21
21
21
21
21
21
21
21
20
17
21
17
17
20
20
20
21
21
21
21
17
21
21
21
21
21
21
20
21
21
21
21
21
21
21
17
21
21
21
21
21
21
21
21
21
21
21
21
21
21
20
21
21
21
21
21