20
21
21
21
21
21
21
21
21
17
21
17
21
12
21
14
21
21
21
17
21
12
21
21
21
21
19
21
20
21
21
17
12
21
21
21
16
20
20
21
21
21
21
21
16
20
21
16
16
13
15
16
21
15
14
16
21
21
20
14
20
21
21
21
12
15
21
16
16
21
21
21
20
12
21
21
21
15
21
21
16
21
21
21
21
21
21
21
11
21
21
21
16
21
21
21
21
16
21
21