20
16
21
21
21
21
15
16
16
16
20
21
21
17
18
21
15
21
21
21
21
21
21
21
16
9
18
21
21
12
21
21
15
17
21
21
21
21
21
16
21
21
19
16
21
21
21
12
21
21
21
21
20
16
21
21
21
21
21
21
21
21
21
21
16
21
20
21
21
21
21
18
21
21
21
12
16
21
18
21
21
21
21
21
20
21
20
21
21
21
21
21
21
21
21
21
21
21
21
15