21
16
16
21
21
15
21
21
21
21
21
21
16
21
16
21
21
21
21
21
21
21
17
21
21
21
21
21
21
21
16
16
21
20
21
21
12
21
16
21
16
21
21
21
21
21
21
21
21
21
21
20
21
21
21
21
21
21
21
21
21
21
21
16
21
21
21
21
16
20
21
21
12
21
16
21
21
21
21
21
21
21
21
21
21
20
21
21
21
21
21
21
21
21
16
20
16
16
21