20
21
16
21
16
21
21
16
21
21
16
21
21
21
21
21
21
21
21
21
21
21
16
21
21
21
21
16
21
21
21
21
21
21
16
16
17
20
16
16
21
21
20
20
21
15
21
21
16
16
20
16
16
20
21
21
15
21
11
14
11
16
21
21
16
16
21
21
21
21
12
21
21
17
21
21
16
16
21
21
21
21
12
20
21
21
21
21
21
15
21
21
21
21
21
20
15
21
21
21