20
21
21
21
21
16
16
21
21
21
21
21
21
21
21
21
21
21
17
20
21
21
21
16
21
16
21
21
16
17
16
21
21
21
12
21
21
12
21
12
16
16
21
21
21
21
15
21
20
21
16
21
16
21
15
18
14
21
14
21
15
21
21
16
21
20
21
16
21
21
21
18
16
21
12
17
12
18
8
15
17
20
17
19
20
15
14
21
21
21
21
13
19
20
21
18
10
10
11
13