21
15
21
15
21
21
21
21
21
21
21
21
21
21
21
21
21
21
21
21
21
21
21
21
18
21
21
16
21
21
21
21
21
16
21
21
21
12
21
21
21
21
21
21
21
21
21
21
21
21
21
21
15
21
21
21
21
21
16
21
21
21
21
21
21
21
15
21
21
21
21
21
21
21
12
21
21
21
21
21
21
21
21
21
21
16
15
21
21
21
21
21
21
21
21
21
21
21
12
21