21
16
12
21
21
21
21
21
21
21
21
15
16
21
21
16
10
21
21
21
18
21
21
21
21
21
16
21
17
21
21
21
18
21
21
21
20
21
16
21
21
21
16
16
21
21
20
20
21
21
21
21
21
21
21
21
18
20
16
20
21
21
16
21
21
21
21
20
21
21
21
16
21
17
21
17
16
12
16
21
12
16
16
21
21
21
15
21
16
18
13
20
18
21
21
21
16
21
17
21