20
21
21
21
21
21
21
21
21
21
21
20
21
21
21
21
21
21
21
21
21
21
21
20
21
21
21
21
21
21
21
21
20
21
21
15
21
21
21
20
21
20
21
21
20
19
21
19
21
21
21
21
21
21
20
21
21
21
20
12
15
15
12
14
13
8
11
17
17
17
15
15
15
12
9
8
12
21
12
15
12
15
15
18
18
18
18
18
18
18
18
18
18
18
21
17
21
21
21
15