15
20
21
21
21
21
15
21
21
21
21
20
21
21
21
21
21
17
21
21
21
21
21
21
21
21
21
21
20
21
21
21
21
21
21
21
21
21
21
21
11
20
17
21
21
21
21
12
21
21
21
21
16
16
21
21
17
16
16
21
21
15
21
16
21
15
21
16
20
21
21
16
21
16
16
21
16
21
12
12
21
21
15
16
14
20
15
18
21
12
16
16
17
16
21
16
21
16
21
21